Clark S. Knowlton, a University of Utah sociology professor and social activist honored for his scholarly and community-based research in ethnic minority issues, died Sunday, Jan. 20, 1991. He was 71.

An expert on land-grant and border issues, segregation, discrimination and inequality, Mr. Knowlton worked to bring the concerns of the poor and downtrodden to the attention of the public and the scholarly community.His research focused on Hispanic Americans as well as Syrians and Lebanese in Brazil. He was inducted into the Utah Rural Development Corp.'s Migrant Worker Advocate Hall of Fame in 1987, and in recognition for his service to the culture and history of New Mexico, was named an Honorable Colonel and Aide de Camp for the state.

Before joining the U. faculty, he was a professor of sociology at universities in Tennessee, Georgia, New Mexico and Texas.

His work with the community included active participation with the Central City Multipurpose Center in downtown Salt Lake City. He also was active with the Rural Sociological Society, the Western Social Science Association, the Association of Borderland Scholars and the Association for Arid Land Studies.

A World War II veteran, Mr. Knowlton also served a mission to Argentina for The Church of Jesus Christ of Latter-day Saints.

The funeral will be Friday noon in the Winder 3rd Ward chapel, 1250 E. 4530 South. Friends may call Thursday from 6 to 8 p.m. at Larkin Mortuary, 260 E. South Temple, and Friday at the ward, 10:45 to 11:45 a.m. Burial will be in Elysian Gardens Cemetery. In lieu of flowers, the family suggests contributions for a minority scholarship fund in care of the U. department of sociology.