The Library of Congress holds a large collection of holograph manuscripts by Anthony Philip Heinrich, most of which have not yet been digitized. The single exception is found below. The manuscripts are cataloged under the call number ML96.H42 (case). See the appendix titled "List of Compositions by Anthony Philip Heinrich in the Music Division of the Library of Congress based on a list prepared by Oscar G. Sonneck, Late Chief of the Music Division," on page 270 of William Treat Upton's book "Anthony Philip Heinrich: A Nineteenth-Century Composer in America" for a full list of the Library's holdings. Visit the Performing Arts Reading Room at the Library of Congress to view the manuscripts on microfilm (MUSIC-1877).
The published music featured below was originally digitized as a part of the project Music for the Nation: American Sheet Music, ca. 1820-1860. More published sheet music by Anthony Philip Heinrich can be found by searching the Library of Congress catalog and visiting the Performing Arts Reading Room.