Columbia subject headings:
American Philosophical Society. Library.
Darwin, Charles, 1809-1882--Manuscripts--Catalogs.
Natural history--Sources--Bibliography--Catalogs.
Harvard subject headings:
American Philosophical Society. Library
American Philosophical Society. Library--Catalogs.
Darwin, Charles, 1809-1882--Manuscripts--Catalogs.
Manuscripts
Manuscripts, English--Pennsylvania--Philadelphia--Catalogs.
Natural history--Sources--Bibliography--Catalogs.
Princeton subject headings:
American Philosophical Society. Library--Catalogs.
Catalogs.
Darwin, Charles, 1809-1882--Manuscripts--Catalogs.
Manuscripts, English--Pennsylvania--Philadelphia--Catalogs.
Natural history--Sources--Bibliography--Catalogs.