Nichols, H. L., Jr. (1962). Moving the earth: The workbook of excavation (2nd ed.). New York: North Castle Books.
Παραπομπή Chicago StyleNichols, Herbert L., Jr. Moving the Earth: The Workbook of Excavation. 2nd ed. New York: North Castle Books, 1962.
Παραπομπή MLANichols, Herbert L., Jr. Moving the Earth: The Workbook of Excavation. 2nd ed. New York: North Castle Books, 1962.
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