{
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 "modelling_note": "Height, width and thickness describe the physical edition represented by each supplied front cover. Exact catalogue measurements are used where available. Records marked hybrid retain sourced page count and trim size, with thickness estimated from binding and page extent when no reliable depth was published.",
 "books": {
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    "spine": "project reconstruction",
    "back": "project reconstruction"
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   "source_url": "https://www.amazon.co.uk/dp/0141990260",
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    "front": "catalogue original",
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    "back": "project reconstruction"
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   "measurement_quality": "catalogue_exact",
   "source_url": "https://www.ebay.com/itm/137004425481",
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    "spine": "project reconstruction",
    "back": "publisher original, via bookstore listing (photographic for two titles)"
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   "weight_g": 1170,
   "weight_source_url": "https://www.thenile.com.au/books/william-n-goetzmann/money-changes-everything/9780691143781"
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   "thickness_mm": 46,
   "measurement_quality": "catalogue_exact",
   "source_url": "https://www.ebay.com/itm/188336481814",
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    "front": "catalogue original",
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   "weight_source_url": "https://www.amazon.co.uk/dp/1933633867"
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   "measurement_quality": "catalogue_exact",
   "source_url": "https://www.ebay.com/itm/177352696432",
   "surface_provenance": {
    "front": "publisher/catalogue original",
    "spine": "project reconstruction",
    "back": "project reconstruction"
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   "thickness_mm": 15,
   "measurement_quality": "catalogue_exact",
   "source_url": "https://openlibrary.org/books/OL9454626M/Archaic_Bookkeeping",
   "surface_provenance": {
    "front": "catalogue original",
    "spine": "project reconstruction",
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   "weight_g": 680,
   "weight_source_url": "https://www.amazon.co.uk/dp/0226586596"
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   "measurement_quality": "catalogue_exact",
   "source_url": "https://www.ebay.com/itm/336122428217",
   "surface_provenance": {
    "front": "catalogue original",
    "spine": "project reconstruction",
    "back": "publisher original, via bookstore listing (photographic for two titles)"
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   "weight_g": 390,
   "weight_source_url": "https://www.thenile.com.au/books/geoffrey-ingham/the-nature-of-money/9780745609973"
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   "pages": 640,
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   "thickness_mm": 34,
   "measurement_quality": "catalogue_exact",
   "source_url": "https://blackwells.co.uk/bookshop/product/9780415610117",
   "surface_provenance": {
    "front": "catalogue original",
    "spine": "project reconstruction",
    "back": "project reconstruction"
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   "weight_g": 956,
   "weight_source_url": "https://www.thenile.com.au/books/georg-simmel/the-philosophy-of-money/9780415610117"
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  "the-rise-and-decline-of-the-medici-bank": {
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   "pages": 512,
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   "thickness_mm": 39,
   "measurement_quality": "hybrid_trim_and_extent",
   "source_url": "https://www.abebooks.com/9780674771451/Rise-Decline-Medici-Bank-1397%E2%80%931494-0674771451/plp",
   "measurement_note": "Page count is ISBN-specific; trim follows the photographed Harvard octavo edition and depth is calculated from extent plus hardcover boards.",
   "surface_provenance": {
    "front": "restored from authentic jacket photograph",
    "spine": "project reconstruction",
    "back": "publisher original, via bookstore listing (photographic for two titles)"
   }
  },
  "how-a-ledger-became-a-central-bank": {
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   "pages": 400,
   "height_mm": 229,
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   "thickness_mm": 19,
   "measurement_quality": "catalogue_exact",
   "source_url": "https://www.bookstores.com/books/how-a-ledger-became-a-central-bank-stephen-quinn/9781108706155",
   "surface_provenance": {
    "front": "publisher/catalogue original",
    "spine": "project reconstruction",
    "back": "publisher original, via bookstore listing (photographic for two titles)"
   },
   "weight_g": 540,
   "weight_source_url": "https://www.thenile.com.au/books/stephen-quinn/how-a-ledger-became-a-central-bank/9781108706155"
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  "the-end-of-alchemy": {
   "isbn": "9781408706107",
   "binding": "hardcover",
   "pages": 448,
   "height_mm": 241,
   "width_mm": 162,
   "thickness_mm": 39,
   "measurement_quality": "hybrid_trim_and_extent",
   "source_url": "https://openlibrary.org/search?isbn=9781408706107",
   "measurement_note": "Page extent and binding are sourced; Royal-octavo trim and depth are modelled from the edition photograph and hardcover page-block calculation.",
   "surface_provenance": {
    "front": "catalogue original",
    "spine": "project reconstruction",
    "back": "project reconstruction"
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   "weight_g": 866,
   "weight_source_url": "https://www.amazon.co.uk/dp/1408706105"
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   "measurement_quality": "catalogue_exact",
   "source_url": "https://www.biblio.com/book/piece-action-how-middle-class-joined/d/1396276162",
   "surface_provenance": {
    "front": "catalogue original",
    "spine": "project reconstruction",
    "back": "publisher original, via bookstore listing (photographic for two titles)"
   }
  },
  "paying-with-plastic": {
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   "thickness_mm": 25,
   "measurement_quality": "catalogue_exact",
   "source_url": "https://openlibrary.org/books/OL9742855M/Paying_with_Plastic_2nd_Edition",
   "surface_provenance": {
    "front": "catalogue original",
    "spine": "project reconstruction",
    "back": "project reconstruction"
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   "weight_g": 658,
   "weight_source_url": "https://www.amazon.co.uk/dp/0262050773"
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  "electronic-value-exchange": {
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   "height_mm": 235,
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   "measurement_quality": "hybrid_trim_and_extent",
   "source_url": "https://www.goodreads.com/work/editions/27928880-electronic-value-exchange-origins-of-the-visa-electronic-payment-system",
   "measurement_note": "Page extent is sourced; trim is Springer's standard History of Computing format and depth is calculated from the 268-page hardcover page block.",
   "surface_provenance": {
    "front": "publisher/catalogue original",
    "spine": "project reconstruction",
    "back": "project reconstruction"
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   "weight_g": 424,
   "weight_source_url": "https://www.amazon.co.uk/dp/1447126238"
  },
  "the-power-of-co-creation": {
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   "height_mm": 220,
   "width_mm": 150,
   "thickness_mm": 20,
   "measurement_quality": "catalogue_exact",
   "source_url": "https://www.portaldoslivreiros.com.br/livro.asp?codigo=7241742&titulo=Livro+The+Power+Of+Co-Creation",
   "surface_provenance": {
    "front": "catalogue original",
    "spine": "project reconstruction",
    "back": "publisher original, via bookstore listing (photographic for two titles)"
   },
   "weight_g": 454,
   "weight_source_url": "https://www.amazon.co.uk/dp/1439181047"
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  "bad-money": {
   "isbn": "9789655180077",
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   "thickness_mm": 36,
   "measurement_quality": "catalogue_exact_with_identifier_warning",
   "source_url": "https://sureshotbooks.com/products/bad-money-fintech-as-an-instrument-in-the-battle-for-global-dominance-9789655180077",
   "measurement_note": "Multiple retailer feeds reuse this identifier inconsistently. These measurements match the Brad Rigden 714-page large-format paperback and the supplied cover, not unrelated catalogue collisions.",
   "surface_provenance": {
    "front": "catalogue original",
    "spine": "project reconstruction",
    "back": "publisher original, via bookstore listing (photographic for two titles)"
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   "weight_source_url": "https://www.thenile.com.au/books/brad-rigden/bad-money/9789655180077"
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   "binding": "hardcover",
   "pages": 288,
   "height_mm": 240,
   "width_mm": 164,
   "thickness_mm": 32,
   "measurement_quality": "catalogue_exact",
   "source_url": "https://www.dymocks.com.au/before-babylon-beyond-bitcoin-by-david-birch-9781907994654",
   "surface_provenance": {
    "front": "publisher/catalogue original",
    "spine": "project reconstruction",
    "back": "publisher original, via bookstore listing (photographic for two titles)"
   },
   "weight_g": 646,
   "weight_source_url": "https://www.thenile.com.au/books/david-birch/before-babylon-beyond-bitcoin/9781907994654"
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   "isbn": "9780674293892",
   "binding": "paperback",
   "pages": 496,
   "height_mm": 235,
   "width_mm": 156,
   "thickness_mm": 33,
   "measurement_quality": "catalogue_exact",
   "source_url": "https://www.thenile.com.au/books/eswar-s-prasad/the-future-of-money/9780674293892",
   "measurement_note": "This models the supplied 2023 paperback ISBN. The 2021 hardcover is a different ISBN and is intentionally not mixed with this cover.",
   "surface_provenance": {
    "front": "publisher/catalogue original",
    "spine": "project reconstruction",
    "back": "project reconstruction"
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   "weight_g": 567,
   "weight_source_url": "https://www.thenile.com.au/books/eswar-s-prasad/the-future-of-money/9780674293892"
  },
  "embedded-finance": {
   "isbn": "9781119891055",
   "binding": "hardcover",
   "pages": 256,
   "height_mm": 234,
   "width_mm": 158,
   "thickness_mm": 31,
   "measurement_quality": "catalogue_exact",
   "source_url": "https://www.amazon.co.uk/dp/1119891051",
   "surface_provenance": {
    "front": "catalogue original",
    "spine": "project reconstruction",
    "back": "project reconstruction"
   },
   "measurement_note": "Amazon UK lists 1.05 kg for this 256-page hardcover, which fails the plausibility check; the recorded weight is thenile.com.au's 454 g. Nile is the preferred source when listings disagree.",
   "weight_g": 454,
   "weight_source_url": "https://www.thenile.com.au/books/scarlett-sieber/embedded-finance/9781119891055"
  },
  "uberland": {
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   "binding": "paperback",
   "pages": 296,
   "height_mm": 229,
   "width_mm": 152,
   "thickness_mm": 20,
   "measurement_quality": "catalogue_exact",
   "source_url": "https://www.amazon.co.uk/dp/0520324803",
   "surface_provenance": {
    "front": "catalogue original",
    "spine": "project reconstruction",
    "back": "project reconstruction"
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   "weight_g": 454,
   "weight_source_url": "https://www.thenile.com.au/books/alex-rosenblat/uberland/9780520324800"
  },
  "this-is-marketing": {
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   "binding": "paperback",
   "pages": 288,
   "height_mm": 234,
   "width_mm": 153,
   "thickness_mm": 21,
   "measurement_quality": "catalogue_exact",
   "source_url": "https://www.amazon.co.uk/dp/0241370140",
   "surface_provenance": {
    "front": "catalogue original",
    "spine": "project reconstruction",
    "back": "project reconstruction"
   },
   "weight_g": 367,
   "weight_source_url": "https://www.thenile.com.au/books/seth-godin/this-is-marketing/9780241370148"
  },
  "crossing-the-chasm": {
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   "binding": "paperback",
   "pages": 288,
   "height_mm": 203,
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   "measurement_quality": "catalogue_exact",
   "source_url": "https://www.amazon.co.uk/dp/0062292986",
   "surface_provenance": {
    "front": "catalogue original",
    "spine": "project reconstruction",
    "back": "project reconstruction"
   },
   "weight_g": 216,
   "weight_source_url": "https://www.thenile.com.au/books/geoffrey-a-moore/crossing-the-chasm/9780062292988",
   "measurement_note": "thenile.com.au lists 28 mm thickness against Amazon UK's 16.5 mm for the same ISBN; the recorded 17 mm follows the Amazon trim, which matches the page block. Weight follows Nile (216 g)."
  },
  "the-new-age-of-innovation": {
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   "binding": "paperback",
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   "thickness_mm": 18,
   "measurement_quality": "catalogue_exact",
   "source_url": "https://www.amazon.co.uk/dp/1260031160",
   "surface_provenance": {
    "front": "catalogue original",
    "spine": "project reconstruction",
    "back": "project reconstruction"
   },
   "weight_g": 374,
   "weight_source_url": "https://www.thenile.com.au/books/c-k-prahalad/the-new-age-of-innovation/9781260031164"
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}