Soil and water conservation /
Troeh, Fredrick R.
Soil and water conservation / J Arthur Hobbs. - New Jersey : Prentice-Hall, c1980. - 718 p. : ill.
Soil conservation.
Water conservation.
S623 / .T76
Soil and water conservation / J Arthur Hobbs. - New Jersey : Prentice-Hall, c1980. - 718 p. : ill.
Soil conservation.
Water conservation.
S623 / .T76