Heisely Surveyor's Vernier Compass

Chicago citation style
Heisely, Frederick. Heisely Surveyor's Vernier Compass. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_745644&repo=DPLA. (Accessed November 13, 2018.)
APA citation style
Heisely, Frederick, Heisely Surveyor's Vernier Compass. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_745644&repo=DPLA
MLA citation style
Heisely, Frederick. Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_745644&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.