
Slippery Rock University dominates the center of this landscape, marking a transition from the dense educational campus to a surrounding terrain defined by water and glacial history. The flow of Wolf Creek and Slippery Rock Creek dictates the placement of early industry, evidenced by a string of historic milling sites including Courtneys Mills, Christleys Mills, Doughertys Mills, and Crolls Mills. These settlements represent the early economic backbone of the region where Butler, Mercer, and Lawrence counties converge.
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1908 · Zelienople
USGS Topo · 1:62,500
1909 · Butler
USGS Topo · 1:62,500
1910 · Zelienople
USGS Topo · 1:62,500
1910 · Hilliards
USGS Topo · 1:62,500
1911 · Butler
USGS Topo · 1:62,500
1912 · Hilliards
USGS Topo · 1:62,500
1913 · Mercer
USGS Topo · 1:62,500
1939 · Mercer
USGS Topo · 1:62,500
1943 · Mercer
USGS Topo · 1:62,500
1944 · Hilliards
USGS Topo · 1:62,500