Irwin, Westmoreland Co., Pennsylvania, July 1904.

Chicago citation style
Sanborn Map Company. Irwin, Westmoreland Co., Pennsylvania, July 1904.. 1904. Retrieved from the Digital Public Library of America, http://digital.libraries.psu.edu/cdm/ref/collection/maps1/id/11272. (Accessed December 10, 2018.)
APA citation style
Sanborn Map Company, (1904) Irwin, Westmoreland Co., Pennsylvania, July 1904.. Retrieved from the Digital Public Library of America, http://digital.libraries.psu.edu/cdm/ref/collection/maps1/id/11272
MLA citation style
Sanborn Map Company. Retrieved from the Digital Public Library of America <http://digital.libraries.psu.edu/cdm/ref/collection/maps1/id/11272>.
Note: These citations are programmatically generated and may be incomplete.