These letters and papers include eighteen letters, concerning botany, from John Eatton LeConte (1816-1829).

Principally letters from John Eatton LeConte, John Lawrence LeConte, Joseph LeConte, and Mrs. Jane LeConte Harden to Mrs. Matilda Jane Harden Stevens, Sumner Morrison Ramsey, Mrs. Ann LeConte Stevens, and Louis LeConte pertaining to family matters and natural history.

Letters and papers to or from American scientists or about America, selected from the Linnean Society's collections. Includes letters to William Swainson from John Abbott, John J. Audubon, Constantine S. Rafinesque, Isaac Lea, and John E. LeConte; letters to Sir James Edward Smith from Jacob Bigelow, DeWitt Clinton, J.F. Correia da Serra, David Hosack, Theodore Lyman, William Dandridge Peck, Rafinesque, and Gotthilf H.E. Muhlenberg; letters to William Darlington; letters to Asa Gray; letters of John Bartram; letters of Peter Collinson to J.F. Gronovius; letters and papers of John Ellis, including letters from Alexander Garden, Samuel Martin, and Bernard Romans; letters to Carl Linnaeus from John Bartram, John Clayton, Cadwallader Colden, Correia da Serra, Peter Kalm, Adam Kuhn, James Logan, John Mitchell, and Charles Wrangel.