There are three Han Solo books from the 70’s.
I still have all three on my shelf.
There’s also a series of Han Solo novels from the 90’s by A.C. Crispin.
I still have all three on my shelf.
I've got them too: Han Solo at Star's End, Han Solo's Revenge, and Han Solo and the Lost Legacy, all by Brian Daley. Somewhere along the line I picked up the trilogy in an omnibus edition from a used bookstore.
At least Han Solo at Star's End was also adapted for the daily Star Wars comic strip in the early 80s, as well, which was my first exposure to the story. I think it would make a pretty good movie, actually—I have no memory of the other two books.
Brian Daley also adapted the original trilogy into radio dramas for NPR, which are well worth hearing.