The History of Calculus
Your calculus book tells you the rules. This one tells you where they came from: who found them, who fought over them, and why your notation looks the way it does. Every fact in it traces to a source somebody read in full, and every disagreement between sources is shown, not smoothed over.
Behind the story sits the reference shelf: 212 people, every symbol and word traced, and 259 sources in full citation. When a date or a story is argued about, the Disputed label says so and Appendix F shows both sides.
How to read this book explains the marks on the page in about five minutes.