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1“...Geological Survey,...”
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2
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3Vydané 1983“...Geological Survey,...”
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4
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5“...Pennsylvania Geological Survey,...”
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6“...Pennsylvania Geological Survey,...”
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7Vydané 1921“...United States Geological Survey,...”
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8Vydané 1921“...United States Geological Survey,...”
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9Autor Rakús, Miloš“...Geological Survey of Slovak Republic, Dionýz Štúr Publishers,...”
Vydané 1998
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10“...Geological Survey of Slovak Republic, Regional Centre Sp. Nová Ves,...”
Kniha