00401nam a2200133Ia 4500008004100000082001300041100002800054245003000082260006000112300001400172490005000186600002200236650000900258140224s9999    xx            000 0 und d  a633.1 L7  aSprague, George F., ed.  aCorn and corn improvement  aMadison (Wisconsin)bAmerican Society of Agronomyc1977  axvi,774p.  aAmerican Society of Agronomy; agronomy; no.18  aGeorge F. Sprague  aCorn