Maclean Square Navigational Protractor

Chicago citation style
J. D. Maclean Co. Maclean Square Navigational Protractor. 1950s-1960s. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_904386&repo=DPLA. (Accessed November 19, 2018.)
APA citation style
J. D. Maclean Co, (1950s-1960s) Maclean Square Navigational Protractor. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_904386&repo=DPLA
MLA citation style
J. D. Maclean Co. Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_904386&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.