This 195 page book in German language is easy to read even if you don’t know German by using the Google Translate app. It contains Bobby Fischer’s best games with the white pieces in the Spanish or Ruy Lopez opening, plus 7 games he played as black. The games are heavily annotated, with a bonus of diagrams every few moves, making it easy to follow even without a board. I paid about $15 for this 33 years ago, worth about $34 today.