Burchett, R. R. (1971). Directory of Nebraska quarries, pits, and mines. University of Nebraska, Conservation and Survey Division.
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Dyfyniad Arddull Chicago
Burchett, Raymond R. Directory of Nebraska Quarries, Pits, and Mines. Lincoln: University of Nebraska, Conservation and Survey Division, 1971.
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Dyfyniad MLA
Burchett, Raymond R. Directory of Nebraska Quarries, Pits, and Mines. University of Nebraska, Conservation and Survey Division, 1971.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.