This pocket notebook covers the period September 1870-January 1872. It is a record of payments made to the iron and steel dealers, Crowell & Coe, for deliveries of materials to Edison & Unger. The front cover is marked "Edison & Unger in a/c with Crowell & Coe." Approximately 30 pages of this unnumbered book have been used.

Courtesy of Thomas Edison National Historical Park.