Union Mills and Silver Run stand as prominent landmarks in this borderland corridor where Pennsylvania and Maryland meet. The landscape is defined by its deep agricultural and milling heritage, with numerous historical processing sites such as Menges Mill, Arters Mill, and Pipe Creek Mill situated along the winding courses of Big Pipe Creek and Piney Creek. These water-powered hubs historically supported the surrounding farmsteads that bridge the Mason Dixon Road.
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1905 · Westminster
USGS Topo · 1:62,500
1908 · Gettysburg
USGS Topo · 1:62,500
1911 · Taneytown
USGS Topo · 1:62,500
1920 · Hanover
USGS Topo · 1:62,500
1922 · Hanover
USGS Topo · 1:62,500
1942 · Gettysburg
USGS Topo · 1:125,000
1944 · Manchester
USGS Topo · 1:31,680
1944 · Union Bridge
USGS Topo · 1:31,680
1944 · Gettysburg
USGS Topo · 1:31,680
1944 · New Windsor
USGS Topo · 1:31,680