Van Kleeck sent some papers related to labor research to the Archives of Labor History and Urban Affairs at Wayne State University. Additional papers of Mary van Kleeck are located at the National Archives, Social and Industrial Branch, in the records of the Department of Labor, Women in Industry Service, Women's Bureau, and War Labor Policies Board.

There is additional material about van Kleeck in the Smith College Archives and many of her published works are available in the Five College Libraries.

Collections in the Sophia Smith Collection with related subject matter include the Employment Collection, the League of Women Shoppers, the Young Women's Christian Association, and the American Association of University Women. The papers of Vida Dutton Scudder include additional materials on College Settlement Work, the Church League for Industrial Democracy, and the Women's Trade Union League. Correspondence from Mary van Kleeck to Ethel Clyde is located in the Biography Collection.