Geologist. Diaries and field notes, letterbooks, correspondence, family papers, subject files, photographs, printed matter, and miscellaneous material relating chiefly to Emmons's family and his career as a geologist.

Investment banker, financier, public official, and owner of the Washington Post . Correspondence, memoranda, minutes, diaries, oral history interviews, speeches, writings, congressional testimony, press statements, financial papers, family papers, biographical material, printed material, scrapbooks, photographs, and other papers relating to Meyer's life and career.