Pete Tamburro, in his new book "Openings for Amateurs- Next Steps", recommends the following books for those who want to learn the Ruy Lopez ...
1. Barden's The Ruy Lopez (already recommended earlier in this thread)
2. Lane's The Ruy Lopez for the Tournament Player
3. King and Ponzetto's Mastering the Spanish ("... may be the best book ever to explain the Ruy ..."; also recommended earlier in this and many other threads)
Lane also has a book "The Ruy Lopez Explained" ... does anyone know anything about this book? It has a 3 star review on Amazon, and that is all I could find on it.
https://www.chessgames.com/perl/chessgame?gid=1785715