Charles S. Murphy, a trustee emeritus of Duke University, has resigned in protest over the proposed establishment of a library at the school to house the political papers of former president Richard Nixon.

The library would house political papers from Nixon's entire political career, stretching from the Red Scare days in Congress to his resignation as president during the 1974 Watergate scandal. Nixon is a graduate of Duke Law School.

"The Nixon Library will be a memorial to Richard Nixon," Murphy said. "Permitting it to be established at Duke will be widely perceived as condoning his conduct. I cannot be part of that." Murphy, a Washington attorney and former adviser to presidents Harry S Truman and Lyndon Johnson, announced his resignation in a letter dated Aug. 19. The letter was not made public until Tuesday.

Murphy is the second Duke trustee to resign over the Nixon library plans. William Styron, a 1947 Duke graduate and the Pulitzer Prize-winning author of "Sophie's Choice," announced his resignation earlier this month.

David Spencer, 19-year-old grandson of late philanthropist John D. Rockefeller III, was in critical but stable condition yesterday with injuries to the right arm and leg, suffered in a car accident Monday afternoon.

Spencer was riding in a car driven by Michael S. Bell, 19, of Greenwich, Conn., which struck a tree off Rte. 448 near the 3,000-acre Rockefeller estate at Pocantico Hills, N.Y. Bell was charged with driving while intoxicated and released on $100 bail, said Mount Pleasant Police Lt. Dave Wylock. The crash occurred three miles from the place Rockefeller died in a head-on collision with a 16-year-old youth in July 1978.

Spencer is the son of Rockefeller's daughter Hope, and is the grandnephew of late governor and vice president Nelson Rockefeller.

Baby, you can buy my car . . .

John Lennon's psychedelic 1956 Bentley will be auctioned off next month at an antique car museum in Auburn, Ind.

With its purple leather seats, hot pink carpeting, paisley drapes and walnut dashboard, the Bentley attracted bids as high as $280,000 when it was put up for sale last month, but owner Ron Morgan, a California collector of classic cars, refused to sell. Morgan bought the vehicle in January and put it on tour. Since then it has earned $65,000 in promotional fees.

Since Lennon sold the car, it has traveled a long and winding road. Apple Corp., the Beatles' company, traded it for a yacht. It was then shipped to the United States, where it toured state fairs. Later, it was sold to the Movie Land Museum in Los Angeles for a "Cars of the Stars Display," where it was exhibited for six years before Morgan bought it. The car is scheduled to be auctioned during the week of Sept. 4.

Actor Richard Thomas, best known as John-Boy in the television series "The Waltons," became the father of triplets yesterday.

Thomas' wife of six years, Alma, gave birth to three girls weighing about 6 pounds each at Hollywood Presbyterian Hospital. A hospital spokesman said the mother and the as-yet-unnamed babies were "all doing fine."

The couple also has one son, Richard Francisco, 4.

Larry Flynt, the paralysed publisher of Hustler magazine, yesterday filed a request in Los Angeles to end his four year marriage to his wife, Althea.

Flynt, 38, citedirreconcilable differences with his 27-year old wife.

The childless couple, married in August, 1976, have been separated since March 10.

Larry Wilcox, co-star of the "CHiPs" television series, flipped his three-wheeled motorcycle while filming an episode in Valencia, Calif. , yesterday afternoon and suffered a concussion and whiplash.

Wilcox was racing along the sand at the Indian Dunes recreational area in the Santa Clara Valley, about 35 miles north of Los Angeles, when the bike suddenly turned over on top of him, Barbara Zunick, an NBC spokeswoman said.

The actor was rushed to a hospital, where he was treated and released.