Acknowledgments

The list of colleagues and supporters is far too extensive to delineate in full, but specific mention must be made, for a broad range of reasons, of a number of persons. For suggestions and information referring to the subject studied here, as well as for a critical examination and correction of essential parts of the manuscript, I thank A. Apostol (New York), Prof. Dr. H. Berckhemer (Institute of Geophysics at the University of Frankfurt), Dr. A. Berktold (Institute of Geophysics at the University of Munich), Prof. Dr. E. Böckh (BGR Hannover), Dr. Eisenburger (BGR Hannover), Prof. Dr. H. Gebrande (Institute of Geophysics at the University of Munich), Prof. Dr. A. Hahn (Niedersächsisches Landesamt für Bodenforschung), R. Koschel (GTZ), P. Krause (GTZ), P. Menche (GTZ), R. Rammner, Dr. U. Schreiber (Geological Institute of the University of Bonn), and Dr. W. Stengel-Rutkowski (Hessisches Landesamt für Bodenforschung). I am particularly indebted to Tom Williamson (Preston, England) for enlightening discussions and his support in editing the English translation. A generous grant by the Schweisfurth-Stiftung, which contributed to produce the present edition, is highly appreciated.

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