Canon Blanco, near "Summit of Spanish Range" of Rocky Mountains, East of Rio Grande, 6,917 feet above tide, 800 miles west of Missouri River

Chicago citation style
Gardner, Alexander, 1821-1882. Canon Blanco, near "Summit of Spanish Range" of Rocky Mountains, East of Rio Grande, 6,917 feet above tide, 800 miles west of Missouri River. 1867-1869. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/70796f394. (Accessed July 22, 2018.)
APA citation style
Gardner, Alexander, 1821-1882, (1867-1869) Canon Blanco, near "Summit of Spanish Range" of Rocky Mountains, East of Rio Grande, 6,917 feet above tide, 800 miles west of Missouri River. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/70796f394
MLA citation style
Gardner, Alexander, 1821-1882. Retrieved from the Digital Public Library of America <http://ark.digitalcommonwealth.org/ark:/50959/70796f394>.
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