James Blish's 1972 Star Trek 6 contains 6 stories adapted by Blish from the screenplays of the 1960s television series.
Credits for the original screenplays are as follows:
"The Savage Curtin" by Gene Roddenberry and Arthur Heinemann,
"The Lights of Zetar" by Jeremy Tarchar and Shari Lewis,
"The Apple" by Max Ehrlich and Gene L. Coon,
"By Any Other Name" by D.C. Fontana and Jerome Bixby,
"The Cloud Minders" by Margaret Armen, David Gerrold, and Oliver Crawford, and
"The Mark of Gideon" by George F. Slavin and Stanley Adams.
As with my reviews of the previous books in the series, about these stories themselves I feel I need say nothing beyond the briefest nod to each: Another alien-forced arena-type battle brings Kirk and Spock face-to-face with the heroes of the own worlds' pasts, mysterious lights in space imperil the Enterprise and especially the wee lassie who is Scotty's girlfriend, a paradise planet of happy primitives must be disturbed when their ruling computer aims at the ship's destruction, invaders from Andromeda hijack the Enterprise on a centuries-long mission to enslave and colonize our galaxy, the complete division of a planet's elegant cloud-dwellers and its stunted miners below threaten the effort to save millions on a different world from complete ecological collapse, and yet another paradise-seeming planet holds a menace that makes Kirk seemingly disappear. After all, anyone choosing the book is already familiar with the episodes of the TV show, right?
As usual, differences pop up here and there between what we are familiar with and the adaptations Blish gives us. Some arise from the various artistic choices needed in adaptation, others from the fact that the scripts given to Blish were not always the most finalized versions. The more familiar the individual reader is with a particular broadcast episode, the more noticeable and potentially interesting such divergences will be.
The one I particularly noted was that the conclusion of "The Apple" has no cutesy hem-and-haw back-and-forth between Kirk and Spock about who should teach the birds and the bees to the innocents to whom "[t]he touching," "[t]he holding," and the resultant "replacements" for themselves had been "forbidden" (1972 Bantam paperback, page 60), moving instead straight to Kirk's noticing of one man comforting a woman with an arm around her waist and the Captain's "grinning" observation that "You just go the way you're going, and you'll find out" (page 67).
In any event, James Blish's Star Trek 6 is not deeply probing or given to evocative or artistic turns of phrase, nor probably is it intended for an audience that has never heard of the starship Enterprise and its historic 5-year mission, but its adventures are swiftly moving and entertaining, and founded upon courage and friendship and the dignity of the individual, and for fans of the television series will be a pleasantly familiar 5-star read.