1969. 2012-10-11T13:58:59Z. 2013-03-18T22:22:55Z. Drake, Avery Ala, 1927-. U.S. Geological Survey. English. Public. New Jersey, Warren County, Pennsylvania, and Northampton County.
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1999. 2012-07-20T20:34:08Z. 2022-12-08T04:40:36Z. Geological Survey (U.S.). The Survey ; Information Services [distributor]. English. Public. Pennsylvania, Bucks County, Lehigh County, and Northampton County.
1996. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Information Services. English. Public. North Carolina, Halifax County, Northampton County, Warren County, Virginia, Brunswick County, and Gaston, Lake, Region (N.C. and Va.).
1996. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey. English. Public. Pennsylvania, Northampton County, Bucks County, and Lehigh County.
1997. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey. English. Public. Pennsylvania and Northampton County.
1990. 2002-06-01T04:00:00Z. 2012-07-05T14:03:50Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. Pennsylvania, Northampton County, and Monroe County.
1996. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Information Services. English. Public. North Carolina, Halifax County, Northampton County, Virginia, Greensville County, Brunswick County, and Gaston, Lake, Region (N.C. and Va.).
1990. 2002-06-01T04:00:00Z. 2012-07-05T15:54:54Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. Pennsylvania, Northampton County, and Monroe County.
1885. 2012-03-14T13:56:57Z. 2012-07-05T13:00:13Z. Geological Survey of Pennsylvania. Second Geological Survey of Pennsylvania. English. Public. Pennsylvania, Ironton, Lehigh County, Northampton County, Northampton County (Pa.), Lehigh County (Pa.), Bucks County (Pa.), Berks County (Pa.), South Mountain Region (Lehigh County, Pa.), and Ironton (Pa.).