Columbia subject headings:
Birtwistle, Harrison--Manuscripts--Facsimiles.
Music--Manuscripts--Facsimiles.
Orchestral music--Scores.
Harvard subject headings:
Birtwistle, Harrison--Manuscripts--Facsimiles.
Guillaume, de Machaut, approximately 1300-1377--Songs and music.
Music--Manuscripts--Facsimiles.
Orchestral music--Scores
Princeton subject headings: