Columbia subject headings:
Botany--Liberia.
Ethnology--Liberia.
Liberia--Description and travel.
Liberia--Social life and customs.
Medical geography--Congo (Democratic Republic)
Medical geography--Liberia.
Tropical medicine.
Zoology--Congo (Democratic Republic)
Zoology--Liberia.
Harvard subject headings:
Botany--Liberia.
Liberia--Description and travel
Liberia--Social life and customs.
Medical geography--Congo (Democratic Republic)
Medical geography--Liberia.
Tropical medicine--Congo (Democratic Republic)
Tropical medicine--Liberia.
Zoology--Congo (Democratic Republic)
Zoology--Liberia.
Princeton subject headings: