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" Parti. The Northern Townships of Butler county. Part II. A special survey made in 1875, along the Beaver and Shenango rivers, in Beaver, Lawrence, and Mercer Counties. "
Geological Survey Bulletin - Seite B-32
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Library Bulletin, Band 1

Cornell University. Libraries - 1886
...that of Cameron, Elk and Forest. 1880. — V. Chance, HM The northern townships of Hutler county. — A special survey made in 1875 along the Beaver and Shenango rivers in Beaver, I,aurence and Mercer counties. 1879. — W. Chance, HM The geology of Clarion county. 1880. Pfeiffer,...
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