. . "1991"^^ . . . "Pesticide residues and food safety : a harvest of viewpoints : developed from a special conference by the division of Agrochemicals of the American Chemical Society, Point Clear, Alabama, 21-25 january, 1990 / B.G. Tweedy, Henry J. Dishburger, Henri J. Ballantine... [et al.] / Washington (D.C.) : American Chemical Society , 1991" . . . . "3"^^ . .