Columbia subject headings:
Crumb, George--Manuscripts--Facsimiles.
Music--Manuscripts--Facsimiles.
String quartets--Scores.
Harvard subject headings:
Crumb, George--Manuscripts--Facsimiles.
Music--Manuscripts--Facsimiles.
String quartets--Scores.
Princeton subject headings:
Scores.
String quartets--Scores.