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Land use and abuse, the Allegheny County problem : guidebook for the 45th annual field conference of Pennsylvania geologists /
Harrisburg, Pa. : Field Conference of Pennsylvania Geologists, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey, 1980

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Conference Proceeding Book
2
Land use and abuse, the Allegheny County problem : guidebook for the 45th annual field conference of Pennsylvania geologists /
Harrisburg, Pa. : Field Conference of Pennsylvania Geologists, Department of Environmental Resources, Bureau of Topographic and Geologic Survey, 1980

Conference Proceeding Book
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