Image Sources

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Varle, Charles P. To The Citizens Of Philadelphia This New Plan Of The City And Its Environs Is Respectfully Dedicated By the Editor. 1802. P.C. Varle Geographer & Enginr. Del, 1802 1802. David Rumsey Historical Map Collection. http://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~205~20052.

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Charles Joseph Staniland, “Vaccination from the Calf / Vaccinating Infants,” Images from the History of Medicine, U.S. National Library of Medicine https://www.flickr.com/photos/nlmhmd/5038805533/in/album-72157624155591660/