The Feynman Lectures on Physics
The Feynman Lectures on Physics is a physics textbook based on a great number of lectures by Richard Feynman, a Nobel laureate who has sometimes been called "The Great Explainer". The lectures were presented before undergraduate students at the California Institute of Technology (Caltech), during 1961–1964.
Source: Wikipedia — The Feynman Lectures on Physics (CC BY-SA 4.0)