sponsored by ASTM Committee D-19 on Water, American Society for Testing and Materials ; R.L. Weitzel, editor. sponsored by ASTM Committee C-1 on Cement, American Society for Testing and Materials ; P.K. Mehta, editor. sponsored by ASTM Committee E-35 on Pesticides, American Society for Testing and Materials ; J. R. Beck, editor. sponsored by ASTM Committee D-19 on Water American Society for Testing and Materials. sponsored by ASTM Committee D 19 on Water, American Society for Testing and Materials, Denver, Colo., 19-20 June 1978. ; C. E. Van Hall, editor. sponsored by ASTM Committee E-28 on Mechanical Testing, American Siciety for Testing and Materials ; J. R. Newby and B. A. Niemeier, editors. sponsored by ASTM Committee E-35 on Pesticides, American Society for Testing and Materials, New Orleans, La., 17 Oct. 1978 ; E. E. Kenaga, editor. sponsored by ASTM Committee D-9 on Electrical Insulating Materials, American Society for Testing and Materials ; R. Bartnikas, E. J. McMahon, editors. sponsored by ASTM Committee G-2 on Erosion and Wear, American Society for Testing and Materials, Vail, Colo., 24-26 Oct. 1977 ; W. F. Adler, editor. sponsored by ASTM Committee E03 on Chemical Analysis of Metals, American Society for Testing and Materials ; editor, J. E. Foster.