Historic American Sheet Music
The Historic American Sheet Music Project provides access to digital images of 3042 pieces of sheet music published in America between 1850 and 1920.
scriptorium.lib.duke.edu/sheetmusic/   reviews

Music for the Nation: American Sheet Music, 1870-1885
Tens of thousands of songs and instrumental pieces registered for copyright in the post-Civil War era.
memory.loc.gov/ammem/smhtml/smhome.html   reviews

The Lester S. Levy Sheet Music Collection - Home Page
The Lester S. Levy Collection of Sheet Music is part of Special Collections at the Milton S. Eisenhower Library of The Johns Hopkins University. It contains over 29, 000 pieces of music and focuses on popular American music spanning the period 1780 to 1960. All pieces of the collection are indexed on this site and a search will retrieve a catalog description of the pieces. An image of the cover ...
levysheetmusic.mse.jhu.edu/index.html   reviews