Star Trek 6

The sixth volume in a series of Star Trek: The Original Series novelizations written by James Blish and published by Bantam Books. Includes six stories: The Savage Curtain, The Lights Of Zetar, The Apple, By Any Other Name, The Cloud Minders, The Mark Of Gideon.

From the back cover:

Kirk, Spock, Bones and the others of the Enterprise find a deadly Eden, discover elemental life forces and planetary death wishes, and even meet Abraham Lincoln and Genghis Khan, as they speed through space on new assignments into the unknown.