Williamsburg, Blair County, Pennsylvania, May, 1910.

Chicago citation style
Sanborn Map Company. Williamsburg, Blair County, Pennsylvania, May, 1910.. 1910. Retrieved from the Digital Public Library of America, http://digital.libraries.psu.edu/cdm/ref/collection/maps1/id/23380. (Accessed December 16, 2018.)
APA citation style
Sanborn Map Company, (1910) Williamsburg, Blair County, Pennsylvania, May, 1910.. Retrieved from the Digital Public Library of America, http://digital.libraries.psu.edu/cdm/ref/collection/maps1/id/23380
MLA citation style
Sanborn Map Company. Retrieved from the Digital Public Library of America <http://digital.libraries.psu.edu/cdm/ref/collection/maps1/id/23380>.
Note: These citations are programmatically generated and may be incomplete.