There are many wonderful Entomology-related collections located in the Rare and Manuscript Collections (RMC) at Cornell. For your convenience, several collections are listed below. Additional resources can be located using a Corporate Name search:
New York State College of Agriculture. Department of Entomology : Browse "works by" and "works about"
Later Heading: New York State College of Agriculture and Life Sciences. Department of Entomology : Browse "works by" and "works about"
In addition to the collections at RMC, Mann Library also holds many exquisite items in the climate-controlled vault in the lower level of the building. Items can be paged for viewing on the 2nd floor reading room. You can find more details about Mann Library Special Collections, and how to request them, here. Included below is just a sample of the many treasures in the vault.