Collected papers of Clarence Joseph Rivers, documenting his activities as a priest, liturgist, composer, and public speaker. His impact on American Catholic life, particularly that of Black Catholics, is reflected in his awards, correspondence, and newspaper clippings. His ministry and professional engagement papers document his involvement with organizations such as the Martin Luther King, Jr. Fellows Program, the National Office for Black Catholics (NOBC), Purcell High School, and Stimuli, Inc. His personal materials include biographical and family ephemera and photographs, as well as materials from Rivers' travels to Africa in the 1970s and 1980s. The collection also features published and unpublished versions of Rivers' liturgy, music, sermons, speeches, and other writings, notably An American Mass program (1963) and A Mass dedicated to the brotherhood of man (1967).