Two men using a drill inside the Alaska Treadwell Gold Mining Co. mine, ca. 1914

Chicago citation style
Curtis, Asahel, 1874-1941. Two men using a drill inside the Alaska Treadwell Gold Mining Co. mine, ca. 1914. ca. 1914. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/curtis/id/1861. (Accessed June 20, 2018.)
APA citation style
Curtis, Asahel, 1874-1941, (ca. 1914) Two men using a drill inside the Alaska Treadwell Gold Mining Co. mine, ca. 1914. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/curtis/id/1861
MLA citation style
Curtis, Asahel, 1874-1941. Retrieved from the Digital Public Library of America <http://cdm16786.contentdm.oclc.org/cdm/ref/collection/curtis/id/1861>.
Note: These citations are programmatically generated and may be incomplete.