By Clifton E. Meloan (Kansas State University, Manhattan, Kansas)
By Daniel Lednicer (Analytical Bio-Chemistry Laboratories, Inc., Columbia, Missouri), Lester A. Mitscher (The University of Kansas School of Pharmacy, Lawrence, Kansas)
By E. Michael Thurman (U.S. Geological Survey, Lawrence, Kansas), M. S. Mills (Zeneca Agrochemicals, Jealott's Hill, UK)
By Daniel Lednicer, Lester A. Mitscher (The University of Kansas School of Pharmacy, Lawrence, Kansas)