00491nam a2200157Ia 4500008004100000082001700041100002400058245007000082260004200152300000800194650004100202650003400243653001200277653002500289700001900314170901s1972    xx            000 0 und d  a631.46bJ51M  aJohnson, Leander. F 0aMethods for Research on the Ecology of Soil Borne Plant Pathogens  aUSAbBurgess Publishing Companyc1972  a247  aAgriculture and related technologies  aTechnology (Applied sciences)  aEcology  aSoil borne pathogens  aCurl, Elroy. A