Soil conservation. assessing the national resources inventory / Vol. 1 :

Xehetasun bibliografikoak
Erakunde egilea:	National Research Council (U.S.). Board on Agriculture. Committee on Conservation Needs and Opportunities
Formatua:	Licensed eBooks
Hizkuntza:	ingelesa
Argitaratua:	Washington, D.C. : National Academy Press, 1986.
Sarrera elektronikoa:	https://search.ebscohost.com/login.aspx?direct=true&scope=site&db=nlebk&AN=15903

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