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Papers of David M. Dennison, professor of physics at the University of Michigan; contain lecture notes and exam materials, correspondence, speeches, files relating to research in theoretical physics, University of Michigan and travel files.

The David M. Dennison Papers contain both the personal correspondence of the Dennison family and items relating to David M. Dennison's research and teaching while at the University of Michigan.

The first part of the collection is correspondence from 1894-1896 from James Lutheran Dennison and his wife to their son Walter Dennison, the father of David M. Dennison. One folder contains correspondence from George Dennison and his wife Nina to his brother Walter Dennison also from the 1890s.

Biographical and personal materials for David M Dennison are comprised of letters from David M. Dennison and his wife, Helen Lenette Johnson, memorial materials from David's death, home finances, and travel information. Family documents in this collection are comprised mostly of his son Edwin's Ph.D. research at the University of Michigan. Dennison's papers include various speeches, articles, and other writings about the physics he was studying, primarily focused on the later part of Dennison's time at the University. Materials from the University of Michigan include lecture notes and exams from the many physics classes Dennison taught. Documents relating to administration of the physics department and David's colleagues are also a part of this collection. Of note is David and Helen's correspondence and connection to the Niels Bohr Institute.

Audio-visual materials in the collection include photographs of David and Helen from the early 1900s through the 1970s. There are also two cassette tapes with recording of talks given by David, as well as photograph negatives and spectroscopic plates, lantern slides depicting astronomical images pertaining to his astro-physics research.

U.S. Ambassador to Japan, 1907-1911, and Italy, 1911-1913. Ledgers and journals, scrapbooks/photograph albums containing clippings, photographs and mementos from his diplomatic career, and miscellaneous correspondence, clippings, and speech material.

The Thomas James O’Brien papers consist of ledgers and journals, scrapbooks/photograph albums containing clippings, photographs and mementos from his diplomatic career, and miscellaneous correspondence, clippings, and speech material. The Collection has been arranged into the following series: Scrapbooks / Photograph Albums; Financial records; and Correspondence and other papers.