000 00340nam a2200133Ia 4500
008 130223s9999 xx 000 0 und d
100 _aJohnson, M.W.
245 _aPennsylvania corn performance studies
260 _aUniversity Park
260 _c1973
440 _aNo. 322; Pennsylvania Agricult
901 _pS22943
942 _cB
_2udc
999 _c129281
_d129281