The A.S. Kleppe Papers mainly consists of the ledger book for Kleppe's watch repair business, dating 1894-1907. The book measures 9.5 by 11.5 inches, and has the words "A.S. Kleppe Northwood, N.D." printed on the front cover. A hand written note on the free endpaper reads "Received Feb 27-94 A.S. Kleppe." The ledger lists over 1,2000 repairs; each entry typically includes the date, watch case, movements, customer name, item repair and the cost of repair. An index is included at the beginning of the book which lists each customer's name.

Also included is one folder of biographical material, as well as one folder containing documents related to the purchase of the ledger book by the Department of Special Collections, as well as material regarding the book's provenance.