Columbia subject headings:
Birtwistle, Harrison--Manuscripts--Catalogs.
Music--Manuscripts--Switzerland--Basel--Catalogs.
Paul Sacher Stiftung (Basel, Switzerland)--Catalogs.
Harvard subject headings:
Birtwistle, Harrison--Maunscripts--Catalogs.
Music--Manuscripts--Switzerland--Basel--Catalogs.
Paul Sacher Stiftung (Basel, Switzerland)--Catalogs.
Princeton subject headings:
Birtwistle, Harrison--Maunscripts--Catalogs.
Catalogs.
Music--Manuscripts--Switzerland--Basel--Catalogs.
Paul Sacher Stiftung (Basel, Switzerland)--Catalogs.