00548nam a2200169Ia 4500001001000000003000500010008004100015010001100056040000900067100001800076245009800094260005300192300001000245440004600255650005300301700002400354Para_3980CHAP220125s1953    xx            000 0 und d  a202244  cCHAP  aHanson, E. W.  aThe black point disease of wheat in the United States  /c E. W. Hanson and J. J. Christensen  aSt. Paul, Minnesota  :b University of Minnesota  a30 p.  aMinnesota Agr. Exp. Sta. Tech. Bull.; 206  aHelminthosporium sativum  Hongos fitopatógenos  aChristensen,  J. J.