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5Published 1990Subjects: “...Wild and scenic rivers Pennsylvania....”
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6Published 1995Subjects: “...Wild and scenic rivers Pennsylvania Allegheny National Forest....”
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7Published 1981Subjects: “...Rivers Pennsylvania....”
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9by Bailey, James F.Subjects: “...Rivers Pennsylvania Philadelphia Region....”
Published 1989
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10Subjects: “...Rivers Pennsylvania Allegheny County Mathematical models....”
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11by Barker, James L., 1936-Subjects: “...Rivers Pennsylvania....”
Published 1986
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12Subjects: “...Rivers Pennsylvania Allegheny Portage Railroad National Historic Site....”
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13by Barker, James L., 1936-Subjects: “...Rivers Pennsylvania Berks County....”
Published 1977
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14by Brush, Lucien M.Subjects: “...Rivers Pennsylvania. http://id.loc.gov/authorities/subjects/sh85114380...”
Published 1961
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15by Williams, Donald R. (Hydrologist)Subjects: “...Rivers Pennsylvania Raystown Branch, Juniata River Water Trail....”
Published 1976
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