The American Institute of Physics has undertaken a project on source materials for the history of recent physics in the United States. One part of the project will be to locate materials that document significant work by twentieth‐century physicists, and to take steps toward the preservation and the cataloging of such material. Another part of the project will be to encourage and initiate historical researches by scholars upon these materials. The project promises to be an important step toward greater efforts by the physics community to document the story of recent developments in physics in the United States for the benefit of contemporary historians of science and—even more—for the benefit of historians of the future.