Thrift Store Finds: Star Trek Books

I actually found a whole bunch of Star Trek books at a local thrift store this morning but I could only pick up two (I had to buy medicine yesterday and that left me real short of cash). The ones that I picked up had to do with Marvel Comics and each were fifty cents. Marvel Illustrated Books: Star Trek is from January, 1982 and has three comic stories while Star Trek The Next Generation and X-Men: Planet X is from May 1998 and is an actual novel. Here are pictures of the front and back covers:

Front covers
Back covers