
Jacks Mountain and Shade Mountain dominate this central Pennsylvania landscape, defining a series of narrow valleys where agriculture and industry settled along the water gaps. The Juniata River carves through these ridges at Mifflintown, creating a transportation corridor shared by the Pennsylvania RR and early highways. This river-and-rail economy is anchored by the borough of Port Royal and industrial points like Cuba Mills and Jericho Mills, where the flow of local streams provided power for early milling operations.
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1907 · New Bloomfield
USGS Topo · 1:62,500
1907 · Millerstown
USGS Topo · 1:62,500
1919 · Mattawana
USGS Topo · 1:62,500
1924 · Centre Hall
USGS Topo · 1:62,500
1924 · Lewistown
USGS Topo · 1:62,500
1925 · Mifflintown
USGS Topo · 1:48,000
1927 · Lewisburg
USGS Topo · 1:62,500
1929 · Centre Hall
USGS Topo · 1:62,500
1930 · Loysville
USGS Topo · 1:62,500
1933 · Loysville
USGS Topo · 1:62,500