Geology of Lehigh and Northampton Counties, Pennsylvania: Historical Works

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Lehigh University Library Services

LEO (The Lehigh Earth Observatory)

Bethlehem Digital History Project

Description of the Geology of Lehigh County Pennsylvania
(Description and map from an 1885 report, available from Pennsylvania State University Libraries)

Description of the Geology of Northampton County Pennsylvania
(Description and map from an 1885 report, available from Pennsylvania State University Libraries)

Pennsylvania Geological Survey

Pennsylvania Geological Survey: Maps and Aerial Photographs

USGS (United States Geological Survey)