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ACKNOWLEDGMENTS The completion of this book would have been impossible without the help and constructive criticism of many people, especially Dr. R. P. W. Scott, Dr. M. P. T. Bradley, Mr. W. K. Hinrichs, and Mr. J. L. McDonald. Grateful acknowledgment is due our managers—Dr. D. P. Ames and Dr. C. J. Wolf of McDonnell-Douglas Corporation, Mr. D. R. Beasecker and Dr. W. E. Koerner of Monsanto Company, and Dr. J. W. Armstrong of Shell Oil Com- pany—for their helpful suggestions and ready assistance. We wish to thank Mrs. Eunice Cray ne, Mrs. Loretta Goins, and Mrs. Joan Waid for their efforts in preparing the manuscript, and Mr. R. H. Pfeffer and Mrs. Katherine Sewell for preparing the artwork. Finally, special thanks to our wives, Virginia Walker, Pat Jackson, and Susan Maynard, and our children for their help, encouragement, and understanding during the past year. XIII
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