na INLIS000000000003956 20240923124925 0010-0924000074 Editor, Thor Kommedahl PROCEEDINGS of Symposia IX International Congress of plant protection, Washington, DC.U.S.A., August 5-11, 1979 : Vol. 1 (Plant Protection Fundamental Aspects) / Thor Kommedahl 411 p. : ills. ; 28 cm. 632 PRO Minneapolis, Minnesota : Burgess, 1981 PLANT PROTECTION, SYMPOSIA IX, WASHINGTON, DC, USA, 1981, PROSIDING PERLINDUNGAN TANAMAN 090/1981