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Major general in the U.S. Army, physicist, and inventor. Correspondence, personal account books, reports, military orders, student notebooks (U.S. Military Academy and Johns Hopkins University), notes and other material largely related to his scientific interests, particularly in telegraphy and trans-oceanic cables; also diaries kept while a West Point cadet, one of which contains a family history and autobiography; Ph.D. thesis in physics from Johns Hopkins University; and photographs.

The George Owen Squier papers include correspondence, personal account books, reports, military orders, student notebooks (U.S. Military Academy and Johns Hopkins University), notes and other material largely related to his scientific interests, particularly in telegraphy and trans-oceanic cables; diaries kept while a West Point cadet, one of which contains a family history and autobiography; Squier's Ph.D. thesis in physics from Johns Hopkins University; and photographs.

The Squier collection has been arranged into the following series: Correspondence; Inventions and Research; Military Career; Miscellaneous / Personal; and Education (West Point and Johns Hopkins).

The Ludwig Family Papers document the lives of members of the Ludwig family from the time of their arrival in the United States of America in 1733, through 1985. This collection includes family histories, scrapbooks, and family photographs. Also included in the collection are both personal and professional papers of Claud Cecil Ludwig, Frederick E. Ludwig, and Ruby Newman Ludwig.

The Ludwig Family record group covers a period of time from the 1850s to the 1980s. The collection of information documenting the history of the Ludwig family includes family histories, ancestral charts, and a large collection of photographic materials. The diaries and scrapbooks included in the collection describe everyday life during the periods covered. The collection is particularly strong in documenting the lives of Claud Cecil Ludwig and Frederick E. Ludwig.