DANBURY, Conn. — Mary Travers, one-third of the hugely popular 1960s folk trio Peter, Paul and Mary, has died.

The trio mingled their music with liberal politics, both onstage and off. Their version of "If I Had a Hammer" became an anthem for racial equality Other hits included "Lemon Tree," "Leaving on a Jet Plane" and "Puff (The Magic Dragon.)"

They were vehement in their opposition to the Vietnam War, managing to stay true to their liberal beliefs while creating music that resonated in the American mainstream.

"Blowin' In the Wind" became an another civil rights anthem, and Peter, Paul and Mary fully embraced the cause. They marched with King in Selma, Ala., and performed with him in Washington.

(Mary) Travers had undergone a successful bone marrow transplant to treat her leukemia and was able to return to performing after that.

"It was like a miracle," Travers told The Associated Press in 2006. "I'm just feeling fabulous. What's incredible is someone has given your life back. I'm out in the garden today. This time last year I was looking out a window at a hospital." She also said she told the marrow donor "how incredibly grateful I was."

Mary Allin Travers was born on Nov. 9, 1936 in Louisville, Ky., the daughter of journalists who moved the family to Manhattan's bohemian Greenwich Village.

Travers lived for many years in Redding, Conn.