Soil and water conservation.
TROEH, Frederick.
Soil and water conservation. - 2nd ed. - New Jersey : Prentice Hall, 1991. - 530 p. : ill. ; 24 cm.
soil conservation
Soil and water conservation. - 2nd ed. - New Jersey : Prentice Hall, 1991. - 530 p. : ill. ; 24 cm.
soil conservation