Library of Congress
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found: His Duo for violin and piano, 1950.
found: Baker, 8th ed. (Kirchner, Leon; b. Jan. 24, 1919, N.Y.; American composer)
found: Wikipedia, WWW site, Sept. 17, 2009 (Leon Kirchner (January 24, 1919-September 17, 2009) was an American composer of contemporary classical music)