Palmer, Robert G.
Introductory soil science laboratory manual / Robert G. Palmer, Frederick R. Troeh. - 2nd ed. - Ames : Iowa State University Press, 1977. - vii, 136 p.
Soil science--Laboratory manuals.
Introductory soil science laboratory manual / Robert G. Palmer, Frederick R. Troeh. - 2nd ed. - Ames : Iowa State University Press, 1977. - vii, 136 p.
Soil science--Laboratory manuals.