The Library of Congress holds a large collection of holograph manuscripts by Anthony Philip Heinrich cataloged under the call number ML96.H42 (case). The manuscripts have been microfilmed on 12 reels found under the call number MUSIC-1877. 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. Due to the manuscripts' fragile condition, the microfilm will be served when you visit the Performing Arts Reading Room.
The Library of Congress holds correspondence by Heinrich in a 1229-page scrapbook compiled by Anthony Philip Heinrich, which contains letters, published editions of some of his music, and newspaper clippings. The call number of this item is ML95.H45 (case). Due to the material's fragile condition, it can be viewed on microfilm reels 11 and 12 of MUSIC-1877.
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