The Jared Eliot Letters are photostat copies of letters [1747-1769?] from the original in the Yale University Library. Thirty-nine letters about farming to Eliot (1685-1763) including correspondence from John Bartram, Peter Collinson, Thomas Fitch, Benjamin Franklin, R. Jackson, William Logan, James Monk, Peter Oliver, W. Robinson, Benjamin Stiles, and Robert Walker.

The Robert L. Usinger Collection on Carolus Linnaeus is a collection of books by Carolus Linnaeus, the founder of systematic biology, on insects and other animals. The collection also includes works about Linneaus.

The Robert Leslie Usinger Collection on Carolus Linnaeus is a collection of books by Carolus Linaeus, the founder of systematic biology, on insects and other animals. The collection also includes works about Linneaus.