Snow crystal images and their associated documentation taken by Wilson A. Bentley in the late 19th and early 20th century.
Elon Howard Eaton (1866-1935) was a noted ornithologist and author of Birds of New York. This collection includes papers related to his research, correspondence, and genealogical materials, as well as photographs of Eaton.
This collection is one of the largest and finest on yellow fever anywhere in the world. It contains monographs and reprints, representing the development of medical thought on yellow fever over the course of a century and a half.