Columbia subject headings:
Africa, Central--Discovery and exploration.
Alexander, Boyd, 1873-1910.
Explorers--Africa, Central--Biography.
Explorers--Great Britain--Biography.
Naturalists--Africa, Central--Biography.
Naturalists--Great Britain--Biography.
Harvard subject headings:
Africa, Central--Discovery and exploration.
Alexander, Boyd, 1873-1910.
Explorers--Africa, Central--Biography.
Explorers--Great Britain--Biography
Naturalists--Africa, Central--Biography.
Naturalists--Great Britain--Biography
Princeton subject headings: