Ronald W. Walker, Richard E. Turley and Glen M. Leonard received the honor at the association's awards banquet on (Friday) May 22, for their book "Massacre at Mountain Meadows," published last year by Oxford University Press. The book has been heralded as the most thorough treatment to date of the 1857 event in which a wagon train of Arkansas emigrants traveling through southern Utah en route to California were killed by Mormon militia men agitated by the approach of a U.S. Army force to put down a supposed rebellion in the territory.