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Scope/Content: In his Reviews of Modern Physics article on Hugh Everett's theory, John Wheeler referenced the philosophical writings of Philip Frank, a philosopher of science at Harvard University. In May 1957, Everett sent Frank the Reviews of Modern Physics preprints, along with a letter in which he identified himself with Frank's broadly empiricist world view. Frank had also written about the historical difficulty of gaining acceptance of new scientific theories, such as the sun-centered solar system proposed by Copernicus. It is probably not a coincidence that Everett referred to Copernicus in his May 31, 1957 correspondence with DeWitt. Writing to Frank on the same day, he referenced the treatment of Copernicus by the 16th century religious and scientific establishment as a way of explaining the rejection of his relative state formulation by Bohr and his followers. Scope/Content: This document is a reproduction of a document found in the John A. Wheeler papers at the American Philosophical Society.