Porcupine Gold Mining Company flume under construction showing workers laying stringers and sills, as seen from above Station No. 1, Porcupine, Alaska, ca. 1907

Chicago citation style
Draper, Herbert Horace, 1855-1913. Porcupine Gold Mining Company flume under construction showing workers laying stringers and sills, as seen from above Station No. 1, Porcupine, Alaska, ca. 1907. ca. 1907. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/alaskawcanada/id/2329. (Accessed September 21, 2018.)
APA citation style
Draper, Herbert Horace, 1855-1913, (ca. 1907) Porcupine Gold Mining Company flume under construction showing workers laying stringers and sills, as seen from above Station No. 1, Porcupine, Alaska, ca. 1907. Retrieved from the Digital Public Library of America, http://cdm16786.contentdm.oclc.org/cdm/ref/collection/alaskawcanada/id/2329
MLA citation style
Draper, Herbert Horace, 1855-1913. Retrieved from the Digital Public Library of America <http://cdm16786.contentdm.oclc.org/cdm/ref/collection/alaskawcanada/id/2329>.
Note: These citations are programmatically generated and may be incomplete.