00634nam a2200205Ia 4500001001000000003000500010008004100015010001100056040000900067082001800076110002900094245010100123260004600224300001100270650003000281650005600311700002100367700002000388700002000408Para_7085CHAP220125s1970    xx            000 0 und d  a205906  cCHAP  aPA 631.46 U55  aUniversity of California  aRoot diseases and soil-borne pathogens  /c by T. A. Toussoun, Robert V. Bega and Paul E. Nelson  aLos Angeles  :b University of California  a252 p.  aRaíces x enfermedades   aSuelos x microbiología  Suelos y fitopatología  aBega, Robert V.   aNelson, Paul E.  aToussoun, T. A