Original manuscripts of Salzedo's compositions and transcripts are kept among the Special Collections of the Curtis Institute of Music, and are in the process of being entered into the library catalog. For a list of these materials in alphabetical original order consult the original finding aid to the collection (Inv. 1-118, to be downloaded from the online finding aid). Photostat copies can be searched in the library catalog (ROC).
The location of Salzedo's personal correspondence, which is not present in the Salzedo collection, is unknown. Letters from Salzedo to Mary Green, 1945-50 can be found in the Mary Green Beckman Collection (MSS 56) in the Curtis Archives.
Related materials pertaining to Carlos Salzedo and the Salzedo Harp Colony at Camden, Maine can be found at the Harold B. Lee Library at Brigham Young University, which holds the Dewey Owens collection on Carlos Salzedo, the Alice Chalifoux papers, and the Salzedo Harp Colony records.
Additional materials relating to Carlos Salzedo, including clippings and sheet music, can be found in the Ball State University Libraries, which hold the Lucille Lawrence Papers, 1921-69 (SPEC.033).
A collection of published works by Salzedo and compositions and arrangements by others, annotated by Salzedo, is held at the New School Archives and Special Collections and Kellen Design Archives.