These are a series of 15 books with original Young Indy stories. In addition to the story they contain an historical note section, and a to find out more section. All were published by Random House and starting with book 9 they also had the Bullseye Book trademark.
On the back cover all books except book #13 have this paragraph:
Young Indiana Jones—you met him in the movie Indiana Jones and the Last Crusade. Now follow more of his adventures as he travels the world, getting into—and out of—trouble in the strangest places. Look for all of the young Indy books!
After "travels the world" books #1, #3, #4, add this:
with his scholar dad
After the first sentence books #9-#12, and #14-#15 insert this sentence:
You've seen him on television in The Young Indiana Jones Chronicles.
This was a series with only one book published. The book was published by Ballantine Books.