ACKNOWLEDGMENTS
I owe a great debt to the numerous authors who over the years have sifted through the history of quantum mechanics in far more detail than I was able to, and whose work I have relied on enormously in writing my own account. I particularly acknowledge the efforts of Abraham Pais and David Cassidy. Of course they and others are not to be held responsible for any errors or idiosyncrasies in my version of history. I could not have researched this book without the use of the Niels Bohr Library of the Center for History of Physics, at the American Institute of Physics in College Park, Maryland. Many thanks to the always helpful staff there. I am also grateful to have had easy access and helpful assistance from the Library of Congress, the libraries of the University of Maryland and George Mason University, and the Smithsonian’s Dibner Library of the History of Science and Technology at the National Mu-
