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1Published 1988“...Catalog of topographic and other published maps, Pennsylvania....”
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2Published 1984“...Index to topographic and other map coverage, Pennsylvania....”
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3Published 1993“...Pennsylvania, index to topographic and other map coverage...”
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4Published 1984“...Pennsylvania Maps....”
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5Published 1984“...Pennsylvania Maps, Topographic....”
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6Published 1984“...Pennsylvania Maps....”
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7Published 1985“...Pennsylvania Maps....”
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12Published 1977“...Pennsylvania base map with highways and contours....”
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13Published 1937“...Pennsylvania at the time of the ratification of the Constitution....”
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14Published 1984“...Pennsylvania Maps, Topographic....”
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16by Durlin, Randall R.Subjects: “...Stream-gaging stations Pennsylvania....”
Published 2009
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17by Zimmerman, Tammy M.Subjects: “...Droughts Pennsylvania....”
Published 2005
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18by Hosterman, John W. (John Wallace), 1923-Subjects: “...Kaolin Pennsylvania....”
Published 1984
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19Published 1985“...Pennsylvania Maps....”
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20Published 1984“...Pennsylvania Maps....”
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