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Correspondence, manuscripts, notes, photographs, and printed materials of Mixer while he was Assistant Director of Columbia University Libraries. The letters deal with his career at Columbia and his other professional activities, chiefly his interest in insurance for libraries which includes his files for the Council on Library Resources-American Library Association Fire and Insurance Protection of Library Resources Project, 1960-1963, and the American Library Association Insurance for Libraries Committee, 1956-1963, of which he was chair. Also, a series of library accreditation evaluation reports, 1954-1962, which he prepared for the Middle States Association of Colleges and Secondary Schools; and some photographs, printed materials relating to insurance for libraries, articles by him, and letters and manuscripts acquired through the Charles Wilson Mixer fund.

The New York Technical Services Librarians (NYTSL) records include correspondence, minutes, memoranda, reports, questionnaires, programs, financial records, membership records, typescript copies of papers presented at meetings, and related printed materials. Several topics of note are the 1926 meeting to honor Margaret Mann; the 1926 cooperative cataloging issue; and the 1946 American Library Association constitution matter.