
Slate Ridge anchors this landscape along the Mason-Dixon Line, where the towns of Delta and Cardiff sit straddled across the Pennsylvania Maryland state border. The region's industrial character is defined by extraction, with the Funkhouser Quarry and several unnamed quarries following the geologic grain of the ridge. While the Old Railroad Grade marks a former transportation corridor, modern activity is centered around the scattered rural communities of Whiteford, Pylesville, and Dublin.
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This is the sole edition of this map. No revisions or reprints were ever made.
1900 · Havre De Grace
USGS Topo · 1:62,500
1901 · Belair
USGS Topo · 1:62,500
1912 · Quarryville
USGS Topo · 1:62,500
1912 · Mc Calls Ferry
USGS Topo · 1:62,500
1942 · Havre De Grace
USGS Topo · 1:62,500
1942 · Bel Air
USGS Topo · 1:62,500
1943 · Quarryville
USGS Topo · 1:62,500
1943 · Mc Calls Ferry
USGS Topo · 1:62,500
1945 · Bel Air
USGS Topo · 1:62,500
1948 · Baltimore
USGS Topo · 1:250,000