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Scope/Content: In spring of 1956, John Wheeler was in residence at the Lorentz Institute in Leiden, Netherlands. In April, 1956 a copy of the long version of Hugh Everett's thesis was sent to Niels Bohr's Institute; the next month, Wheeler traveled to Copenhagen to discuss the thesis with Bohr and others. This is a letter from Aage Petersen thanking Wheeler for his visit and returning the copy of Everett's thesis that Wheeler had sent to Bohr in April. Scope/Content: This document is a reproduction of a document found in the John A. Wheeler papers at the American Philosophical Society.