Divorced. Joan Baez, 32, folk singer and veteran antiwar activist; and David Harris, 27, who recently served 20 months in a federal penitentiary for refusing induction into the Army in 1968; after five years of marriage and one son; in Redwood City, Calif.

Died. Richard Tregaskis, 56, a war correspondent who hit the Solomon Islands beach with the first boatload of Marines in 1942 and recorded his experiences in a World War II classic, Guadalcanal Diary; apparently of drowning; in Honolulu. Although his 6-ft. 7-in. frame provided an easy target for enemy guns, Tregaskis was wounded seriously only once while covering a total of nine wars. A novelist and screenwriter as well, Tregaskis wrote his last war book, Vietnam Diary, in 1963.

Died. Arthur William Radford, 77, the first Navy admiral to serve as Chairman of the Joint Chiefs of Staff (1953-57) and an ardent crusader for naval airpower; of cancer; in Bethesda, Md.

Radford became a naval flyer after serving in World War I and commanded the Pacific Fleet during the Korean War. A renowned naval strategist, he supported President Eisenhower's belief that the Communist threat to America could be met only with the coun-terthreat of massive nuclear retaliation.

Died. Conrad Aiken, 84, Pulitzer-prizewinning poet; of a heart attack; in Savannah, Ga. A close friend and Harvard classmate of T.S. Eliot's, Aiken began publishing poems in 1914. Influenced by both Sigmund Freud and Harvard Philosopher George Santayana, Aiken searched in his poetry and prose for musical and psychological truth --an effort resulting in rich mental atmospheres but lacking in drama and force. Best known for his Selected Poems, for Ushant, a third-person autobiography, and for a number of short stories, notably Silent Snow, Secret Snow, Aiken published more than 50 books of poetry, fiction and essays during his 57-year literary career. His final poetic work, Thee, published in 1971, summarized his personal philosophy "that there are no final solutions, that things may have no meaning."

Died. Dr. Selman Abraham Waksman, 85, a pioneer in microbiology who coined the term "antibiotic" in 1941 and two years later isolated streptomycin, the first antibiotic treatment for tuberculosis; of a cerebral hemorrhage; in Hyannis, Mass. The Ukrainian-born scientist, who came to America in 1910, headed the Rutgers team that spent four years sifting through 100,000 different microbes to find streptomycin; in 1952 he was awarded the Nobel Prize for his achievements in medicine.

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