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Filtering: Subject: Erie County, Pennsylvania
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Hexamer General Surveys, Volume 19, Plates 1775-1776
 Maps 1883-1884: Hexamer General Surveys: Volume 19, Plates 1756/7-1853/4
Hexamer General Surveys, Volume 9, Plates 784-785
 Maps 1873-1875: Hexamer General Surveys: Volume 9, Plates 756/8-854/5
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