Quarter Bin 111 "Whitman Star Trek"

Star Trek: The Psychocrystals (Whitman)
from 1976

Some of the early Star Trek comics, before the franchise revival.  Technically at this point not only the original series but The Animated Series existed.  But this comic is pretty rubbish.  It barely seems to care about characterization.  Scotty's accent comes and goes, for instance, depending on whether or not the writer cares to make the effort. 

Whitman was repackaging Gold Key material, by the way:

Gold Key is the publisher history knows better.  Marvel briefly had rights to Star Trek around the release of The Motion Picture, but DC had gained control by Wrath of Khan, and held onto it for years.  At the moment, and on the whole doing a really good job, is IDW.  But Star Trek comics have never been as famous as Star Wars comics.  There the rights have always been pretty clear-cut: from Marvel (Howard Chaykin! drew the original adaptations) to Dark Horse to Marvel again.

But if you like the original series, Gold Key/Whitman's output would probably satisfy you.  The intent seems to have been to closely mirror the spirit of the TV adventures.  No doubt helped fans keep in touch with the spirit of the TV show.