Soil conservation /
Hudson, Norman.
Soil conservation / Norman Hudson. - 3rd rev. and updated ed. - Ames, Iowa : Iowa State University Press, c1995. - 391 p. : ill., maps.
0813823722
Soil conservation.
Soil erosion.
Soil conservation / Norman Hudson. - 3rd rev. and updated ed. - Ames, Iowa : Iowa State University Press, c1995. - 391 p. : ill., maps.
0813823722
Soil conservation.
Soil erosion.