Columbia subject headings:
Congo River--Discovery and exploration.
Johnston, Harry, 1858-1927.
Stanley, Henry M. (Henry Morton), 1841-1904.
Harvard subject headings:
Congo River--Discovery and exploration.
Johnston, Harry, 1858-1927.
Stanley, Henry M. (Henry Morton), 1841-1904
Princeton subject headings:
Congo River--Discovery and exploration.
Johnston, Harry, 1858-1927.
Stanley, Henry M. (Henry Morton), 1841-1904.