Lenticular Ruler with Rivet Tables

Chicago citation style
IMEX. Lenticular Ruler with Rivet Tables. ca 1974. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_904787&repo=DPLA. (Accessed November 19, 2018.)
APA citation style
IMEX, (ca 1974) Lenticular Ruler with Rivet Tables. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_904787&repo=DPLA
MLA citation style
IMEX. Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_904787&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.