Sayre quadrangle, Pennsylvania : 15 minute series (topographic)

Chicago citation style
Geological Survey (U.S.). Sayre quadrangle, Pennsylvania : 15 minute series (topographic). 1942. Retrieved from the Digital Public Library of America, http://collection1.libraries.psu.edu/cdm/ref/collection/maps1/id/564. (Accessed September 21, 2018.)
APA citation style
Geological Survey (U.S.), (1942) Sayre quadrangle, Pennsylvania : 15 minute series (topographic). Retrieved from the Digital Public Library of America, http://collection1.libraries.psu.edu/cdm/ref/collection/maps1/id/564
MLA citation style
Geological Survey (U.S.). Retrieved from the Digital Public Library of America <http://collection1.libraries.psu.edu/cdm/ref/collection/maps1/id/564>.
Note: These citations are programmatically generated and may be incomplete.