Telescope mirrors made of aluminum

Chicago citation style
Telescope mirrors made of aluminum. Unknown. Retrieved from the Digital Public Library of America, http://digital.library.temple.edu/cdm/ref/collection/p15037coll3/id/1215. (Accessed December 18, 2018.)
APA citation style
(Unknown) Telescope mirrors made of aluminum. Retrieved from the Digital Public Library of America, http://digital.library.temple.edu/cdm/ref/collection/p15037coll3/id/1215
MLA citation style
Retrieved from the Digital Public Library of America <http://digital.library.temple.edu/cdm/ref/collection/p15037coll3/id/1215>.
Note: These citations are programmatically generated and may be incomplete.