Progress - "leveling ground in pit"

Chicago citation style
Progress - "leveling ground in pit". 1955-03-30. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/nz80b7954. (Accessed July 15, 2018.)
APA citation style
(1955-03-30) Progress - "leveling ground in pit". Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/nz80b7954
MLA citation style
Retrieved from the Digital Public Library of America <http://ark.digitalcommonwealth.org/ark:/50959/nz80b7954>.
Note: These citations are programmatically generated and may be incomplete.