This folder contains correspondence about rubber products and raw materials. Most of the items for 1919 relate to Edison's interest in obtaining many different samples for experimentation. Included are letters from the Continental-Mexican Rubber Co. regarding guayule rubber; N. W. Haynes on the publication of rubber prices in Drug & Chemical Markets; and John M. Larney about a substitute for gutta-percha. Other correspondents include Dr. William Chauncey Geer of the B. F. Goodrich Co., who invites Edison to visit the company's factories in Akron, Ohio; John J. Carroll of the Firestone Tire & Rubber Co.; and Shun Nomura of Mitsui & Co. Related items on Edison's use of Firestone rubber can be found in E-19-55 (Personal).

Approximately 65 percent of the documents have been selected. The unselected material includes a printed document regarding a "process for the vulcanisation of caoutchouc"; routine correspondence about the transmission and receipt of samples; and items duplicating information contained in the selected documents.