College Park Elementary students in geography lesson

Chicago citation style
College Park Elementary students in geography lesson. ca. 1970. Retrieved from the Digital Public Library of America, http://content.mpl.org/cdm/ref/collection/GHS/id/20. (Accessed June 1, 2020.)
APA citation style
(ca. 1970) College Park Elementary students in geography lesson. Retrieved from the Digital Public Library of America, http://content.mpl.org/cdm/ref/collection/GHS/id/20
MLA citation style
Retrieved from the Digital Public Library of America <http://content.mpl.org/cdm/ref/collection/GHS/id/20>.
Note: These citations are programmatically generated and may be incomplete.