ebrary, Inc. (1986). Soil conservation: Assessing the national resources inventory. National Academy Press.
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Chicago Style (17th ed.) Zitazioa
ebrary, Inc. Soil Conservation: Assessing the National Resources Inventory. Washington, D.C.: National Academy Press, 1986.
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MLA (9th ed.) Zitazioa
ebrary, Inc. Soil Conservation: Assessing the National Resources Inventory. National Academy Press, 1986.
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Kontuz: berrikusi erreferentzia hauek erabili aurretik.