The bulk of the collection consists of Frederick C. Jenison's papers for the period 1907-1939. Included are personal and business records, primarily expenditure reports. The personal correspondence includes copies of letters that Jenison sent. The papers are most complete for the 1930s, less complete for the 1920s, and rather incomplete for the period 1910-1920. One significant portion of the collection consists of check stubs, both personal and business, for most of the period 1907-1939. These check stubs include the recipient of the check, the amount of the check and the reason for which the check was written. Additionally, extensive personal bills for the 1930s are found in the collection which include some detailed, weekly grocery bills, as well as utility bills and various other household expenditures. Also, Jenison kept a record of all expenditures for his automobiles (several during the 1930s). His business papers include correspondence with the insurance companies that he represented, as well as his account records with those companies.

The Nelson F. Jenison papers document his financial activities for the period, 1877-1907. These papers include deeds, mortgages and investment records.