Author and physicist. Correspondence, diary, writings, bibliography, notes, notebooks, biographical material, awards, photographs, newspaper clippings, printed matter, and other material relating chiefly to Coblentz's work in the fields of infrared spectroscopy and to the application of radiometry to astronomical problems.

Paleontologist, educator, and author. Correspondence, articles, memoranda, notes, reports, speeches, drawings, maps, photographs, memorabilia, printed matter, and other materials mainly concerning Merriam's work as chairman of the National Research Council, president of the Carnegie Institution of Washington, and regent of the Smithsonian Institution.

Astronomer, mathematician, and economist. Correspondence, diaries, commonplace books, drafts of speeches, articles, reviews, and books, financial papers, genealogical papers, charts, tables, computations, photos, and printed matter reflecting Newcomb's personal and family life, his work in mathematics and astronomy, his writing of articles for encyclopedias and other publications, and his work as president of the International Congress of Arts and Sciences.