The Alfred Charles True Papers include manuscripts, notes, and drafts of works True was engaged in writing, as well as papers and documents that he accumulated for historical research between 1900 and 1929. The materials reflect his interest in agricultural history and relate especially to his trilogy of histories on research, education, and extension work.

The Collection on Franklin Delano Roosevelt consists of copies of press releases, presidential addresses, inaugural addresses, executive orders, and newspaper articles about President Franklin Delano Roosevelt, all pertaining to agricultural matters. It is likely that this collection was originally housed in the library of the USDA Bureau of Agricultural Economics.

The Daniel Poppleton Account Book (typewritten copy, 1939) is titled "A Pioneer Farmer of Licking County, Ohio...1818-1852." Most of the entries in the account book are debit items. Little money was in circulation at that time, and marketing of farm products was accomplished through barter. There is an introduction to the account book written by W.W. Stockberger, which provides biographical information about Poppleton and an explanation of the account book.

The Emerson Merlyn Brooks Papers contain the original manuscript material, worksheets, photographs, and maps relating to Brooks' book, The Growth of a Nation: A Pictorial Review of the United States from Colonial Days to the Present (1956). There are also materials intended for use in a book called Pictorial Agriculture-USA.

The Everett Eugene Edwards Papers include Edwards' writings, speeches, bibliographies, administrative information related to his position at the United States Department of Agriculture (USDA), materials for courses he taught, and historical materials that he may have used for research.

The Grant Thorburn and Sons Invoice Book is a 50-page volume containing invoices for flowers, trees, and seeds related to business transactions of the Grant Thorburn and Sons seed company.