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William Orville Hickok
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The minerals of Pennsylvania: Iron ores of Pennsylvania
William Orville Hickok · Department of Internal Affairs, Topographic and Geologic Survey
21 sayfa · 1939
Iron ores
Geology and mineral resources of Fayette County, Pennsylvania
William Orville Hickok · Dept. of Internal Affairs, Topographic and Geologic Survey
530 sayfa · 1940
Mines and mineral resources / Geology