00474nam a2200157Ia 4500001001000000003000500010008004100015010001100056040000900067100001700076245009100093260004600184300001000230440003600240650004000276Para_4123CHAP220125s1930    xx            000 0 und d  a202683  cCHAP  aCoons, G. H.  aThe sugar-beet leaf-spot disease and its control by direct measures  /c by G. H. Gons  aWashington  :b Department of Agriculture  a20 p.  aEUA. Dep. of Agr. Circular; 115  aRemolacha azucarera x Enfermedades