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1by Stuckey, Marla H.Subjects: “...Streamflow Pennsylvania History....”
Published 2012
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2by Johnson, Leland R.Subjects: “...Dams Pennsylvania Pittsburgh History....”
Published 1985
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3Subjects: “...Ceramic industries Pennsylvania Philadelphia History....”
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4by Chappell, Gordon S.Subjects: “...Locomotives Pennsylvania History....”
Published 1991
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5Published 1991Subjects: “...Tunnels Pennsylvania Design and construction History....”
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6by Myers, Susan H.Subjects: “...Ceramic industries Pennsylvania Philadelphia History....”
Published 1980
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7by Fritz, David L.Subjects: “...Canals Pennsylvania History....”
Published 1993
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8Published 1990Subjects: “...Engineering Pennsylvania Fayette County History....”
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9Published 1992Subjects: “...Coal mines and mining Pennsylvania History....”
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10by Unrau, Harlan D.Subjects: “...Valley Forge State Park (Agency : Pa.) History....”
Published 1985
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11by Glaser, Leah S.Subjects: “...Hopewell Furnace National Historic Site (Agency : U.S.) History....”
Published 2005
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12by Hoffman, John N.Subjects: “...Mines and mineral resources Pennsylvania History....”
Published 1972
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13by Brown, Bertram S.Subjects: “...African Americans Pennsylvania Philadelphia History....”
Published 1976
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14by Brown, Sharon A.Subjects: “...Steel industry and trade Pennsylvania Johnstown (Cambria County) History....”
Published 1989
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15by Anderson, Susan H.Subjects: “...Carpets Pennsylvania History 18th century....”
Published 1978
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16by Unrau, Harlan D.Subjects: “...Gettysburg National Cemetery History....”
Published 1991
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17Published 2002Subjects: “...Steel industry and trade Pennsylvania History....”
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18Published 2003Subjects: “...Steel industry and trade Pennsylvania History....”
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19Published 2007Subjects: “...Steel industry and trade Pennsylvania History....”
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20Published 1893Subjects: “...Universities and colleges Pennsylvania History....”
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