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Much of the collection contains materials unique to RUDI . The collection documents in considerable depth the range of Aristotle 's works as well as the Renaissance response to his works . Unrestricted income from endowments is used to support critical institutional operations , including funds for exhibitions , educational outreach , scholarly studies , and collections acquisitions . The collection documents Renaissance reading in all its diversity and from a personal and individual perspective not otherwise available . Collection documents the history of signs and symbols , encompassing early printed books on memory , cryptography , decipherment of unknown languages , universal languages , stenography , and exploratory communication systems for blind and deaf persons . It has been possible to describe groupings of taxa ( collections and races , Table 1 ) and of variables ( knob presence or frequency , Table 2 ) . The reference collection includes encyclopedias , handbooks , indexes , bibliographies , and specialized reference works .