Columbia subject headings:
Gubaidulina, Sofia, 1931---Manuscripts--Facsimiles.
Music--Manuscripts--Facsimiles.
Songs (Low voice), Unaccompanied.
Harvard subject headings:
Gubaidulina, Sofia, 1931---Manuscripts--Facsimiles.
Hildegard, Saint, 1098-1179--Musical settings.
Music--Manuscripts--Facsimiles
Sacred songs (Low voice), Unaccompanied.
Princeton subject headings: