In the preparation of this book I owe a great debt to friends and to institutions. As always, the good fortune of historians rests on archives and archivists. I have been particularly favored by wonderful manuscript collections at Marquette University, the Jewish Theological Seminary and Yivo Institute in New York, N. W. Ayer and Company, the Hebrew Union College in Cincinnati, Wheaton College in Wheaton, Illinois, and the Lutheran Theological Seminary and the Moody Bible Institute in Chicago. Particularly rewarding were trips to Middletown, Connecticut, for the Frank Capra Papers, to Harvard for the Donald Menzel and Harlow Shapley Papers, to Philadelphia for the UFO Papers, to the University of Washington in Seattle, and to the Truman library at Independence, Missouri. The Library of Congress Manuscripts Division and the National Archives in Washington, D.C., and Washington State were indispensable.