Columbia subject headings:
Harvard subject headings:
Electronic music.
Music--Manuscripts--Facsimiles.
String quartets--Scores.
Subotnick, Morton--Manuscripts--Facsimiles.
Princeton subject headings:
Electronic music.
Music--Manuscripts--Facsimiles.
Scores.
String quartets--Scores.
Subotnick, Morton--Manuscripts--Facsimiles.