The Origins of International Rivalry in Samoa: 1845–1884
Wilkes, Ch. Narrative of the United States Exploring Expedition.Atlas, Vol. V, 1844. (The Admiralty charts are based upon these.)
Admiralty Chart. Samoa or Navigator Islands, 1885.
P. Langham's Special Karte der Samoa Inseln. Gotha, 1900.
United States Congress Docs. 50th Congress, 1st Sess. House Ex. Doc. No. 238. Map of Upolu showing plantations of the D.H. & P.G.
Map of Apia Municipal and Neutral territory.