00474    a2200157   4500022000600000082001600006100002400022245009500046260004400141300001800185650001600203650003100219700002300250700002100273700002200294  a`  a633.08bPRA  aAhlgren, Gilbert H.  a Practical field crop production for the Northeastban elementary introduction to agronomy  aNew JerseybRutgers Collegec1947g1947  ax,437p.c23cm  aAgriculture  aField and plantation crops  asprague, Milton A.  aSnell, Robert S.  aAnderson, John C.