Columbia subject headings:
Avant-garde (Music)--Analysis, appreciation.
Brecht, George--Manuscripts--Facsimiles.
Brecht, George--Notebooks, sketchbooks, etc.
Cage, John--Influence.
Fluxus (Group of artists)
Manuscripts, English--Facsimiles.
Harvard subject headings:
Princeton subject headings:
Brecht, George--Notebooks, sketchbooks, etc.