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Correspondence, manuscripts, memoranda, receipts, certificates, financial and legal documents, envelopes, clippings, pamphlets, and other printed materials dealing with social and family relationships, the sons' education, professions, and military careers, the Mexican-American War and the Civil War, real estate and financial matters, and with the deaths and bequests of various family members. Among the cataloged correspondents are: Alexander Hamilton, John Church Hamilton, Gen. Schuyler Hamilton, Ralph Isaacs Ingersoll, Charles Augustus Peabody, Gen. J. Fred Pierson, Gen. Winfield Scott, Martin Van Buren, and a manuscript by George Washington.

Correspondence, manuscripts, documents, photographs, and memorabilia of Helen May MacLachlan. There are 570 letters from John Masefield and his wife to James Alexander MacLachlan, his wife Mary, and their children Howard James and Helen, 1916-1966, autograph poetry manuscripts, drawings, clippings, and 43 books presented by Masefield to Helen MacLachlan. Also, correspondence about the Theodore Roosevelt Association from Horace Marden Albright, Ethel Roosevelt Derby, Hermann Hagedorn, and others as well as correspondence from personal friends; and photographs of the MacLachlan family and friends.

The collection consists of the professional papers of Koji Nakanishi. The files contain correspondence with collaborators, graduate students, and others in the scientific community; files related to patents owned by Nakanishi; and subject files highlighting Nakanishi's scholarly interests and scientific pursuits throughout his career.

Correspondence, lists, photographs, reports, printed ephemera, and audio and video tapes which reflected the activities of Russian-American Medical Society of New York.

An unpublished series of letters recording a visit to the United States and Canada in 1841-1842. Following in the footsteps of Harriet Martineau (Society in America, 1837) and coinciding with Charles Dickens's visit to the United States and the subsequent publication of American Notes (1842), these letters provide an invaluable account of life in Antebellum America.

The Chinese Diary Collection contains 850 volumes of hardbound and softbound diaries, dating from 1930s to 1980s. Some volumes are filled with writing from cover to cover; some, partially filled; and some, with brief inscriptions. It includes 81 volumes by different individuals of Republican Period (1912-1949) and 95 small volumes penned by an engineer, with scientific data and personal contents. The contents recorded in the dairies are significant, for instance, a set of 20 work diaries by a mid-rank public security cadre member during and after the Cultural Revolution offers detailed history of public security operations for two decades. A set of 10 work diaries by an officer working in a ministry of the State Council in the 1980s documented the political and daily lives before and after the Tiananmen Massacre in association with the students' pro-democracy movement.