21
Author: Flaherty, Kathy J.
Published 2002
Record Source: Published Materials
“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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22
Author: Harper, John A.
Published 1990
Record Source: Published Materials
“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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23
Author: Moyer, Forrest Theodore, 1906-
Published 1937
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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24
Published 1923
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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25
Published 1928
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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26
Author: Pettke, Charles Reinhard.
Published 1919
Record Source: Published Materials
“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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27
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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28
Published 1962
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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29
Author: Patrick, Austin Lathrop, 1889-
Published 1924
Record Source: Published Materials
“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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30
Published 1925
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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31
Author: Sevon, William D.,
Published 2000
Record Source: Published Materials
“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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32
Author: McCoy, Kaycee L.
Published 2007
Record Source: Published Materials
“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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33
Author: Faill, Rodger T.
Published 2004
Record Source: Published Materials
“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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34
Author: Marshall, R. B. 1867-1949.
Published 1912
Record Source: Published Materials
“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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35
Published 2003
Record Source: Published Materials
“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
Moraine and McConnells Mill State Parks, Butler and Lawrence Counties.
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36
Published 1944
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“...Pennsylvania. Bureau of Topographic and Geologic Survey....”
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