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3Published 1989Subjects: “...Wetland conservation Pennsylvania....”
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6by Beck, Paul AllenSubjects: “...Energy conservation Pennsylvania Allegheny County Public opinion....”
Published 1980
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8Published 2003Subjects: “...Conservation Reserve Enhancement Program (U.S.)...”
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9Published 1945Subjects: “...Soil conservation. http://id.loc.gov/authorities/subjects/sh85124329...”
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11Published 1939Subjects: “...Soil conservation. http://id.loc.gov/authorities/subjects/sh85124329...”
Electronic resource (PDF)
Government Document eBook -
12Published 1939Subjects: “...Soil conservation. http://id.loc.gov/authorities/subjects/sh85124329...”
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13Published 1984Subjects: “...Conservation of natural resources Pennsylvania....”
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15Published 2004Subjects: “...Conservation Reserve Enhancement Program (U.S.)...”
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16Published 2016Subjects: “...Conservation Reserve Enhancement Program (U.S.)...”
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17by Speakman, Joseph M., 1940-Subjects: “...Civilian Conservation Corps (U.S.) Pennsylvania History....”
Published 2006
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18Published 1986Subjects: “...Nature conservation Pennsylvania....”
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19by Shaw, Mark D.Subjects: “...Agriculture Pennsylvania Energy conservation....”
Published 1970
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20by Hayter, Sheila J.Subjects: “...Haverford College Buildings Energy conservation....”
Published 2005
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