The Core Historical Literature of Agriculture (CHLA) is the name of both a digital preservation project and the resulting digital library which began at Cornell University's Albert R. Mann Library in 1994. It is notable as an early digital library and, unlike later book digitization projects by Google and Microsoft, where the focus is mainly on the wholesale scanning of massive numbers of titles, its collection follows a scholarly selection methodology with a specific subject focus (primarily agriculture). Although CHLA is a much smaller collection than that of Google Books Library Project, for example, all of its titles are considered academically and historically important, and all texts in CHLA are freely accessible.