00314nam a2200109Ia 450000500170000000800410001708200120005810000170007024500630008726000460015030000080019620260224040958.0260224s9999||||xx |||||||||||||| ||und||  a631 ACQ  aAcquaah, G.  0aPrinciples of crop production: theory, techniques, & tech.  aUpper Saddle River, : Prentice Hallc2001  a460