Cofnodi Dyfyniadau
Dyfyniad APA
Estados Unidos Department of Agriculture. (1921). Field operations of the bureau of soils. U.S.Department of Agriculture.
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Dyfyniad Arddull Chicago
Estados Unidos Department of Agriculture. Field Operations of the Bureau of Soils. U.S.Department of Agriculture, 1921.
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Dyfyniad MLA
Estados Unidos Department of Agriculture. Field Operations of the Bureau of Soils. U.S.Department of Agriculture, 1921.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.