Não informado. (1911). Annals of the Association of American Geographers. Association of American Geographers.
Chicago-referens (17:e uppl.)Não informado. Annals of the Association of American Geographers. Washington: Association of American Geographers, 1911.
MLA-referens (8:e uppl.)Não informado. Annals of the Association of American Geographers. Association of American Geographers, 1911.
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