Social reformer, Lecturer, Social researcher, Writer, Social worker. Papers include correspondence, biographical material, clippings, speeches, writings, research notes, subject and organization files, primarily from van Kleeck's professional life. There is a significant amount of material relating to Smith College, her work in social and charitable agencies such as ACLU, National Woman's Party, Bryn Mawr Summer School for Student Workers, Hospites (a refugee rescue organization), the Women's International Democratic Federation, the Women's Trade Union League, and the National Research Council. Also the Russell Sage Foundation's Department of Industrial Studies where she conducted investigations of the Rocky Mountain Fuel Company, United Mine Workers, and the coal industry, and her work with Mary Anderson at the Women's Bureau and Mary Fledderus at the International Industrial Relations Institute, 1925-47.

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Permission to cite the papers for quotations or for publication beyond "fair use" must be obtained from the Sophia Smith Collection. The ownership of Mary van Kleeck's copyright is unknown. Copyright to writings of persons other than Mary van Kleeck is owned by those individuals or their heirs or assigns. It is the responsibility of the researcher to identify and satisfy the holders of all copyrights.