This folder contains correspondence regarding the business of the National Phonograph Co. Much of the material pertains to the Maryland Phonograph Co., sales agent for the National Phonograph Co. Included are letters concerning difficulties in establishing company operations, relations with local distributors, and a dispute with agents representing the American Graphophone Co. Most of the letters are from Charles R. Miller, co-owner of the Maryland Phonograph Co., to his brother-in-law, Walter S. Mallory, president of the National Phonograph Co.

Less than 10 percent of the documents have been selected. The following categories of documents have not been selected: routine letters regarding orders for phonographs, records, and other supplies; arrangements with distributors; unsolicited requests for foreign sales agencies that received no significant response; and routine financial matters.