1865. 2008-07-31T15:35:22Z. 2018-10-03T21:33:45Z. Plumb, H. S., cartographer. J.H. Colton. English. cartographic image. Public. Pennsylvania and Pennsylvania.
Search Results
1885. 2012-03-14T13:27:17Z. 2012-07-11T15:16:54Z. Geological Survey of Pennsylvania. Second Geological Survey of Pennsylvania. English. Public. Pennsylvania. Quaternary.
1921. 2010-08-31T18:52:03Z. 2019-03-04T19:01:58Z. Richardson, G. B. U.S. Geological Survey. English. Public. Pennsylvania.
1982. 2016-06-29T14:13:35Z. 2016-09-26T18:11:03Z. Harper, J. A. The Bureau. English. Public. Pennsylvania and Pennsylvania.
1932. 2010-08-31T18:24:04Z. 2015-10-27T22:25:36Z. Pennsylvania. Bureau of Topographic and Geologic Survey. Topographic and Geologic Survey. English. Public. Pennsylvania.