00517nam a2200157Ia 4500001001000000003000500010008004100015010001100056040000900067100002200076245007900098260005800177300001000235440005700245650005700302Para_3536CHAP220125s1939    xx            000 0 und d  a202060  cCHAP  aPierpont, Roger L  aTerpene ethers in pyrethrum and rotenone fly sprays  /c Roger L. Pierpont  aNewark, Delaware  :b Agricultural Experiment Station  a59 p.  aDelaware. Agri. Exp. Sta., Bull.; 217, Technical; 24  aInsecticidas x Análisis  Piretro como insecticida