Jacks Mountain and Penns Creek Mtn dominate this section of central Pennsylvania, carving out a series of ridges and narrow valleys defined by historic watercourses. The drainage of Moyers Mill Run and the north branch of Middle Creek feed into Walker Lake, a prominent water body situated just east of Troxelville. The terrain is characterized by sharp gaps like Schrader Gap and Breininger Gap, which historically dictated the paths of travel through this ridge-and-valley landscape.
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1907 · Millerstown
USGS Topo · 1:62,500
1925 · Mifflintown
USGS Topo · 1:48,000
1934 · Mifflintown
USGS Topo · 1:62,500
1937 · Mifflintown
USGS Topo · 1:62,500
1937 · Millheim
USGS Topo · 1:48,000
1938 · Mifflinburg
USGS Topo · 1:48,000
1941 · Millheim
USGS Topo · 1:62,500
1943 · Millerstown
USGS Topo · 1:62,500
1943 · Mifflinburg
USGS Topo · 1:62,500
1950 · Harrisburg
USGS Topo · 1:250,000