The database catalog is essentially based on physically accessible archive material, stored at the companies that still exist and others that succeeded the production companies that were active at the time. Catalog compilations created by specialist authors are also used, supplemented by newly acquired research knowledge.
Victor Talking Machine Company releases, including RCA-Victor recordings, were made in the United States and Central and South America prior to 1939. This includes audio recordings that were borrowed from the Gramophone Company's recordings catalog. (Sources: Sony Music Entertainment Archive and the University of California, Santa Barbara).
Recordings for the Columbia Records label, made between 1901 and 1934. (Source: Columbia Master Book Discography by Tim Brooks and Brian Rust).
Pressings of the Berliner Gramophone Company from 1892 to 1900. (Source: Berliner Gramophone Records: American Issues 1892-1900 by Paul Charosh).
Pressings of the OKeh Records label, which were made from 1918 to 1934. (Source: Discography of OKeh Records 1918-1934 by Ross Laird and Brian Rust).
Releases from Zonophone Records. (Sources: Discographies The American Zonophone Discography: Volume I, Ten- and Twelve-Inch Popular Series (1904–1912) and The American Zonophone Discography: Volume II, Seven-, Nine-, and First Ten-Inch Series (General Catalog, 1900–1905), the latter unpublished, both prepared by William R. Bryant and Allan Sutton).
Recordings made by Decca Records between 1934 and 1974 (Source: The Decca Labels: A Discography by Michael Ruppli).
Pressings of the Brunswick Records label. (Source: Brunswick Records: A Discography of Recordings, 1916-1931 by Ross Laird).
Releases from Leeds & Catlin Records. (Source: Leeds & Catlin Records by William R. Bryant and Allan Sutton).
The American Discography Project is partnered with the National Jukebox Project of the Library of Congress. As a result, Victor Talking Machine Company publications from 1900 to 1925, including additional recordings digitized by the University of California, Santa Barbara, are available.
^"Discography of American Historical Recordings". adp.library.ucsb.edu. Retrieved October 6, 2020.
^"UCSB Library Receives NEH Grant to Digitize Historic Sound Recordings". neh.gov. April 9, 2020. Retrieved October 6, 2020.
^"PHI's Programs in Music". packhum.org. Retrieved October 6, 2020.
^"Credits, Sources, and Permissions". adp.library.ucsb.edu. Retrieved October 6, 2020.
^"Discography of American Historical Recordings". library.ucsb.edu. Retrieved October 6, 2020.
^"About this Collection: The National Jukebox". loc.gov. Retrieved October 6, 2020.