Columbia subject headings:
Manuscripts, American--Pennsylvania--Philadelphia--Catalogs.
Natural history--North America--History--19th century--Sources--Bibliography--Catalogs.
Natural history--North America--Manuscripts--Catalogs.
Scientific expeditions--North America--History--19th century--Sources--Bibliography--Catalogs.
Scientific expeditions--North America--Manuscripts--Catalogs.
Harvard subject headings:
Manuscripts, American--Pennsylvania--Philadelphia--Catalogs.
Natural history--North America--History--19th century--Sources--Bibliography--Catalogs.
Natural history--North America--Manuscripts--Catalogs.
Scientific expeditions--North America--History--19th century--Sources--Bibliography--Catalogs.
Scientific expeditions--North America--Manuscripts--Catalogs.
Princeton subject headings:
Manuscripts, American--Pennsylvania--Philadelphia--Catalogs.
Natural history--North America--History--19th century--Sources--Bibliography--Catalogs.
Natural history--North America--Manuscripts--Catalogs.
Scientific expeditions--North America--History--19th century--Sources--Bibliography--Catalogs.
Scientific expeditions--North America--Manuscripts--Catalogs.