Spring Mills and the surrounding Gregg Township valleys are defined by a complex network of gaps and limestone springs where Penns Creek and Sinking Creek carve through the ridge-and-valley landscape. This 2010 USGS survey details a region where traditional agricultural settlements like Farmers Mills and Penn Hall coexist with large tracts of state forest land. The topography is marked by significant elevation changes, from the prominent Egg Hill to the high elevations of Sand Mountain and Big Poe Mountain.
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This is the sole edition of this map. No revisions or reprints were ever made.
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
1934 · Mifflintown
USGS Topo · 1:62,500
1937 · Mifflintown
USGS Topo · 1:62,500
1937 · Millheim
USGS Topo · 1:48,000
1941 · Millheim
USGS Topo · 1:62,500
1943 · Lewistown
USGS Topo · 1:125,000