
The ridge-and-valley landscape of the Allegheny Front defines this 1990s record of the border between Clearfield and Centre Counties. The settlement at Sandy Ridge serves as a central point for the region's transport history, where the Conrail line and an Old Railroad Grade navigate the steep ascent of Sandy Ridge. To the north, the industrial footprint of extractive mining is visible through numerous Strip Mines and other extraction sites that pockmark the terrain near Glass City.
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This is the sole edition of this map. No revisions or reprints were ever made.
1903 · Houtzdale
USGS Topo · 1:62,500
1905 · Houtzdale
USGS Topo · 1:62,500
1920 · Altoona
USGS Topo · 1:62,500
1922 · Philipsburg
USGS Topo · 1:62,500
1922 · Altoona
USGS Topo · 1:62,500
1923 · Tyrone
USGS Topo · 1:62,500
1929 · Tyrone
USGS Topo · 1:48,000
1933 · Tyrone
USGS Topo · 1:62,500
1939 · Philipsburg
USGS Topo · 1:62,500
1944 · Houtzdale
USGS Topo · 1:24,000