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Ashley, Geo. H. (George Hall), 1866-1951 · Pennsylvania Topographic and Geologic Survey
102 sayfa · 1933
Pennsylvania -- Description and travel
Ashley, Geo. H. (George Hall), b. 1866. · Pennsylvania Bureau of Topographic and Geologic Survey
22 sayfa · 1921
Pennsylvania. Bureau of Topographic and Geologic Survey / Mines and mineral resources Pennsylvania / Mineral industries Pennsylvania.
Ashley, Geo. H. (George Hall), 1866-1951. · Pennsylvania Bureau of Topographic and Geologic Survey
26 sayfa · 1921
Mineral industries -- Pennsylvania
Ashley, Geo. H. (George Hall), 1866-1951. · Pennsylvania Bureau of Topographic and Geologic Survey
160 sayfa · 1926
Mines and mineral resources -- Pennsylvania
Ashley, Geo. H. (George Hall), 1866-1951. · Pennsylvania Topographic and Geologic Survey
308 sayfa · 1940
Mines and mineral resources -- Pennsylvania -- Clearfield County
Ashley, Geo. H. (George Hall), 1866-1951. · Pennsylvania Bureau of Topographic and Geologic Survey
168 sayfa · 1931
Geology -- Pennsylvania -- Bibliography