The Feynman lectures are also available on the Internet archive:<p><a href="https:&#x2F;&#x2F;archive.org&#x2F;details&#x2F;TheFeynmanLecturesOnPhysicsVolumes1_3_1963" rel="nofollow">https:&#x2F;&#x2F;archive.org&#x2F;details&#x2F;TheFeynmanLecturesOnPhysicsVolum...</a><p>You can download them in several formats, including PDF and even pure ASCII.