Professors Bertil Andersson and Britt-Marie Sjöberg, Arrhenius Laboratories for Natural Sciences, University of Stockholm, S-106 91 Stockholm, Sweden
Karin Feltzin, Stockholm, Sweden
M. Marsland, Yale University, University of Colorado, Boulder
Tryckindustri AB, Solna
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Every effort has been made by the publisher to credit organizations and individuals with regard to the supply of photographs and illustrations. The publishers apologize for any omissions which will be corrected in future editions.