Star Trek: The New Voyages was an interesting experiment -- a "professional" book published by Bantam Books but featuring a series of Star Trek stories written by fans. The first volume featured a forward by Gene Roddenberry and story introductions from Shatner, Nimoy, Kelley, Doohan, Takei, Nichols, and Majel Barrett-Roddenberry.
The first volume was published in March 1976. My copy is from the first printing and was purchased on 7 July 1983.
The second volume was published in January 1978. My copy is from the 2nd printing.