Columbia subject headings:
Africa, Central--Discovery and exploration.
Africa, Eastern--Discovery and exploration.
Explorers--Italy--Biography.
Piaggia, Carlo, 1827-1882.
Harvard subject headings:
Africa, Central--Discovery and exploration.
Africa, Eastern--Discovery and exploration.
Explorers--Italy--Biography
Piaggia, Carlo, 1827-1882
Princeton subject headings:
Africa, Central--Discovery and exploration.
Africa, Eastern--Discovery and exploration.
Piaggia, Carlo, 1827-1882.