Map of the Bering River Coal Field: showing distribution of the various kinds of coal and location of the coal sections and coal samples described in Bulletin 335

Chicago citation style
Martin, G. C. (George Curtis), 1875-1943. Map of the Bering River Coal Field: showing distribution of the various kinds of coal and location of the coal sections and coal samples described in Bulletin 335. 1915. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/4m90fc081. (Accessed July 20, 2018.)
APA citation style
Martin, G. C. (George Curtis), 1875-1943, (1915) Map of the Bering River Coal Field: showing distribution of the various kinds of coal and location of the coal sections and coal samples described in Bulletin 335. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/4m90fc081
MLA citation style
Martin, G. C. (George Curtis), 1875-1943. Retrieved from the Digital Public Library of America <http://ark.digitalcommonwealth.org/ark:/50959/4m90fc081>.
Note: These citations are programmatically generated and may be incomplete.