From: https://commons.wikimedia.org/wiki/File:Map_of_Perkiomen_and_Skippack_Town... Uploaded by John Freed. Last modified over 5 years ago. 4 control points.
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File:Map of Perkiomen and Skippack Township, Montgomery County, Pa., 1857.jpg
From: https://commons.wikimedia.org/wiki/File:Map_of_Perkiomen_and_Skippack_Town... Uploaded by John Freed. Last modified over 5 years ago. 4 control points. Links: Wikimedia Commons
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