Unidentified machinery

Chicago citation style
Unidentified machinery. 1979. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/nz808745k. (Accessed July 20, 2018.)
APA citation style
(1979) Unidentified machinery. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/nz808745k
MLA citation style
Retrieved from the Digital Public Library of America <http://ark.digitalcommonwealth.org/ark:/50959/nz808745k>.
Note: These citations are programmatically generated and may be incomplete.