Columbia subject headings:
Antislavery movements--Africa.
Great Britain. Royal Navy--Biography.
Hydrographic surveying--Africa--History.
Hydrographic surveying--Great Lakes (North America)--History.
Owen, W. F. W., 1774-1857.
Harvard subject headings:
Antislavery movements--Africa.
Great Britain. Royal Navy--Biography.
Hydrographic surveying--Africa--History.
Hydrographic surveying--Great Lakes--History.
Owen, W. F. W., 1774-1857.
Princeton subject headings: