00438nam a2200157Ia 4500001001000000003000500010008004100015010001100056040000900067100001600076245007500092260004600167300001000213440002900223650002800252Para_4339CHAP220125s1939    xx            000 0 und d  a202866  cCHAP  aRoark, R. C  aThe history of the use of derris as an insecticide  /c by R. C. Roark  aWashington  :b Department of Agriculture  a79 p.  aEUA. Dep. of Agri. E-468  aDerris como insecticida