Contains papers of Julian Alden Weir, dating from 1873 to 1952 primarily in New York, and Paris. The papers include his artwork, correspondence, newspaper articles, and work under his official capacity as the President of the National Academy of Design.

Contains unpublished writings by Julian Alden Weir, dated from June 23, 1893 to May 1, 1914. The articles are on Bastien-LePage and John H. Twachtman. Both letters were rejected by R. U. Johnson of The Century Magazine.

Contains correspondence, eulogies, and speeches made by Julian Alden Weir on behalf of the National Academy of Design, dated April 1915 to 1920 in New York. The correspondence are concerning official business, deaths, and speeches made to the annual meetings.

Contains the papers of various members of the Weir family, including Robert Walter Weir (1803-1889), John F. Weir (1841-1926), and Julian Alden Weir (1852-1919) and others. Contains correspondence, diaries, scrapbooks, manuscripts, speeches, artwork, clippings, and published material relating to the family, dating from between 1765 to 1952. The bulk of the collection relates to Julian Alden Weir.

Contains a riddle book belonging to William Bayard Weir, dated circa March 1878. Riddles are collected by famous authors on various subjects including scriptures and anagrams. The joke book was made by William's sister-in-law, Anna C. Weir and six envelopes contain loose papers found between pages of the book.