Every work of nonfiction owes a great debt to those people who have opened the way to sought-after information. Sometimes, this is in the form of a small but valued tip about the location of new material or needed assistance in finding an archival holding. An author is often met with a kindness that goes well beyond professional courtesy, and that certainly applies to the persons listed herein. Some have been briefly helpful; others have provided long-term support in a number of ways; all are very gratefully acknowledged.
The following are people who have helped me in the pursuit of information, and have encouraged and indulged me as only friends will do: Dr. Josef Henke, Detlef Kuehn, and Dr. Hans-Adolf Jacobsen. In addition, I received from these people willing services, both large and small, without which I could not have written this book: Siobhan A. Keppler, Rebecca Lentz Collier, John Kirchhofer, Dr. Walter Naasner, Richard Wiggers, Margarete Eichlemann, Dr. Werner Breunig, Inge Kessler, Iris Winkler, Karin Kopka, Bernd C. Hesslein, Renate Brasack, Daria D’Arienzo, John H. Wright, Dr. William Stivers, Horst-Peter Schulz, Rainer Hildebrandt, Tricia Pyne, Carol A. Leandenham, Peter Jessup, James Leyerzapf, Renate Tybussek, John E. Taylor, and William Burr.
As always, an immeasurable debt is owed my wife Jutta, who provided assistance and translation suggestions, as well as unending patience as my work consumed my time.