In addition to the Abecedarium, Colon found time for a separate cataloguing enterprise, offering a detailed note on each of his purchases, including where it was printed, where he had bought it and how much he paid. This detailed record allows us a view of the workings of the international book market of unprecedented subtlety.

Andrew Pettegree, Arthur der Weduwen, The Library- A Fragile Hist…, loc. 211