The Bradford Oil Field and Ormsby Oil Field define much of this Pennsylvania landscape, reflecting the region's enduring connection to petroleum extraction. Settlements like Gifford, Ormsby, and the eponymous Cyclone are scattered along a network of winding roads, many following the natural contours of the northern Allegheny plateau. The topography is deeply incised by drainages such as Kinzua Cr and Threemile Run, which have carved out significant features like the Kinzua Gorge.
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This is the sole edition of this map. No revisions or reprints were ever made.
1924 · Bradford
USGS Topo · 1:62,500
1926 · Bradford
USGS Topo · 1:62,500
1933 · Smethport
USGS Topo · 1:62,500
1935 · Mt. Jewett
USGS Topo · 1:48,000
1937 · Smethport
USGS Topo · 1:62,500
1940 · Mt. Jewett
USGS Topo · 1:62,500
1941 · Bradford
USGS Topo · 1:62,500
1944 · Bradford
USGS Topo · 1:62,500
1948 · Crosby
USGS Topo · 1:62,500
1948 · Crosby
USGS Topo · 1:24,000