This folder contains correspondence and other documents relating to the commercial development of Edison's phonograph in the United Kingdom, Germany, Mexico, and Russia. Included are testimonials from Russian composers and musicians and letters about the presentation of the phonograph to Porfirio Diaz, Czar Alexander III, and Friedrich Krupp. Among the correspondents are Josef Hofmann, the Polish pianist; Thomas B. Connery, Edison's phonograph agent in Mexico; and Julius H. Block, Edison's agent in Russia.

Approximately 60 percent of the documents have been selected. The following categories of documents have not been selected: routine requests for phonographs, supplies, and agencies; letters of transmittal; duplicate copies of selected documents.