00395nam0a2200121i004500001000500000005001700005035001500022041000800037100002300045245011500068260005600183300003400239606820260715160143.0  atr986052010 aeng1 aErdmann, Gayne. G.10aMacronutrient deficienty symptoms in seedlings of four northem hardwoods /c[Aut. ] Gayne G. Erdmann [i in. ].  aSt. Paul :bU. S. Department of Agriculture,c1979.  a36 s. :bil. , tab. ;c27 cm.