(27) Smith, . V. , Street, J. C. , Schultz, C. R. , and Harris, L. E. 



1961. Dieldrin residues on vegetation in an irrigated pasture. 

 Jour, Econ., Ent. 54(6) t 1091-1096. 



(28) Union Carbide and Chemical Corp. 



1958. Method 30 Ul-*. 15-7. July 9. 



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