Columbia subject headings:
Harvard subject headings:
Crumb, George--Manuscripts--Facsimiles.
Music--Manuscripts--Facsimiles.
Percussion and piano music--Scores.
Pianos (2) with percussion--Scores.
Quartets (Pianos (2), percussion)--Scores.
Princeton subject headings:
Quartets (Pianos (2), percussion)--Scores.
Scores.