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Kolonialpolitik : mein politisches Vermächtnis
Solf, Wilhelm Heinrich, (1919)
Searchlight on German Africa : the diaries and papers of Dr. W. Ch. Regendanz ; a study in colonial ambitions
Pick, F. W., (1939)
Germany's first bid for colonies , 1884-1985 : a move in Bismarck's European policy
Taylor, A. J. P., (1938)