I read plenty of Zane Gray. He had one where the main character was helping build one of the big western dams. Boulder or Hoover. Great book.
One day, I was at a garage sale and just didn’t have the money for the entire Louis L’Amour collection. Still kicking myself
Oh, that would be a great collection to have.
You could probably find a lot of them on Amazon as used books or Powells Used Books.