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1by Ashley, Geo. H. (George Hall), 1866-1951“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
Published 1933
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2by Foose, Richard Martin, 1915-“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
Published 1945
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3by Smith, Laurence Lowe, 1896-“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
Published 1931
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4by Koppe, Edwin F.“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
Published 1967
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5by Foose, Richard Martin, 1915-“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
Published 1945
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6Published 1971“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
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7by Behre, Chas. H. (Charles H.)“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
Published 1927
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8by Behre, Chas. H. (Charles H.)“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
Published 1933
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9by Miller, Benjamin L. (Benjamin LeRoy), 1874-1944“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
Published 1925
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10by Kelley, Dana R.“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
Published 1969
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11Published 1970“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
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12Published 1949“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
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13by Ashley, Geo. H. (George Hall), 1866-1951“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
Published 1922
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14by Dickey, Parke Atherton, 1909-“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
Published 1943
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15by Dickey, Parke Atherton, 1909-“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
Published 1941
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16by Fettke, Charles R. (Charles Reinhard), 1888-1959“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
Published 1946
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17by Fettke, Charles R. (Charles Reinhard), 1888-1959“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
Published 1953
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18by Fettke, Charles R. (Charles Reinhard), 1888-1959“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
Published 1923
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19by Sherrill, R. E. (Richard Ellis), 1899-1952“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
Published 1941
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20by McGlade, William G.“...Bulletin (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”
Published 1967
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