1943 and 1944. Stanford Geospatial Center. This polygon shapefile is an index to 1:100,000 scale maps of Papua New Guinea, titled 'Kūchū shashin sokuryōzu Bisumaruku Guntō jūomanbun no ichi.... Stanford Digital Repository.
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Great Britain, Admiralty., Hydrographic office. and United States, Hydrographic Office. Compiled from German government charts and other authorities to 1933 ; Published at the Admiralty 11th June 1934, under the Superintendence of Capt... Hydrographic Office of the Admiralty,.