Too many topics, too little time

Medieval Manuscripts in Dutch Collections — Koninklijke Bibliotheek:
This database contains descriptions of all medieval western manuscripts written in Latin script and produced up to c. 1550 now preserved in public and semi-public collections in the Netherlands. These include the collections of libraries, museums and archives, as well as the collections of monastic orders and some other private institutions that are open to researchers.

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this is really handy for a wide variety of scholars. it has quite a few things by erasmus, which is one of those people that i like to read.