00261nam a22000977a 4500003000400000008004100004082001600045100002400061245002700085260005100112OSt230605b        |||||||| |||| 00| 0 eng d  a631.5bP30P  aPearson, C. Lorentz  aPrinciples of Agronomy  aAmericabReinhold Publishing Corporationc1967