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5Published 1970“...Annual report (Pennsylvania State University. Institute for Research on Land and Water Resources)...”
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6Published 1967“...Research paper (Pennsylvania State University. School of Forest Resources)...”
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9Published 1953“...Bulletin (Pennsylvania State University. Agricultural Experiment Station)...”
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10Published 1953“...Circular (Pennsylvania State University. Agricultural Extension Service)...”
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11Published 1976“...Circular (Pennsylvania State University. Cooperative Extension Service)...”
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12Published 1954“...Leaflet (Pennsylvania State University. Agricultural Extension Service)...”
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13Published 1980“...Leaflet (Pennsylvania State University. Cooperative Extension Service)...”
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14
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15Published 1887“...Bulletin (Pennsylvania State University. Agricultural Experiment Station)...”
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16Published 1941“...Circular (Pennsylvania State University. Agricultural Extension Service)...”
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17Published 1948“...Extension circular (Pennsylvania State University. cooperative Extension Service)...”
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18Published 1940“...Research paper (Pennsylvania State University. School of Forest Resources)...”
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20Published 1982“...Report (Pennsylvania State University. Center for the Study of Higher Education)...”
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