Subject retrieval in the seventies new directions proceedings of an International Symposium held at the Center of adult education University of Maryland College Park, May 14 to 15, 1971 - Wellisch, Hans H., 1920-; Wilson, Thomas D (Westport, Conn. Greenwood Press, 1972)
Includes bibliographies.
Keywords: Subject cataloging -- Congresses; Classification -- Books -- Congresses; Information retrieval -- Congresses