Abstract
The Hans Reichenbach Collection, part of the Archives of Twentieth Century Philosophy of Science, is located at the University of Pittsburgh. In the past few years work on the recently acquired Hans Reichenbach Collection has resulted in a useful research source. A great deal of organizational work on the collection has now been completed, and the correspondence is open to study by interested scholars. What follows is an overview of the correspondence catalogued in the collection. All of the information recorded here has been found in the many thousand letters to and from Reichenbach which make up only a portion of the collection. The purpose of this essay is both to acquaint the philosophical public with the wealth of material in this research source and to argue for the importance of this material for the history of recent philosophy.