Boyd Evison, 69, whose career in the National Park Service included overseeing the Exxon Valdez oil spill, died Friday in Beverly Hills, Calif., of cancer.

During his 42 years in the Park Service, Mr. Evison held positions including superintendent of Saguaro National Monument and later the Horace Albright Training Center in Grand Canyon National Park, where he influenced many future employees of the Park Service.

He also was superintendent of Great Smoky Mountains National Park, assistant director for park operations in Washington, and Grand Canyon's interim superintendent.

In 1985, Mr. Evison became Alaska regional director and oversaw cleanup of the Exxon Valdez oil spill.

Mia Slavenska, 86, one of the leading ballerinas of the Ballet Russe de Monte Carlo, co-founder of the Slavenska-Franklin Ballet and a respected former teacher at the University of California, Los Angeles and California Institute of the Arts, died Saturday in Los Angeles.

Born Mia Corak Slavenska in Croatia, she began her studies at the Zagreb Opera Ballet School, where she became prima ballerina at age 17.

She began creating dances for herself when she was 12 and went on to be one of three dancer-choreographer winners - the other two were Harald Kreutzberg and Mary Wigman - at the Berlin Dance Olympics, held concurrently with the 1936 Olympic Games.

She went on to dance in London and Paris. Her role in the 1937 prize-winning French film La Mort du Cygne (released in the United States as Ballerina) brought her further fame.