These lectures notes run from the fall of 1966 to 1971. Feynman lectured prior to this period and continued on after 1971. With a few exceptions, the actual 2 hours lectures were not dated. However, the volumes in chronological order.
I want to stress, again, that these are my personal notes and are only a representation of the lectures I attended. They are to the best of my ability my recreation from memory and my original real time notes. No AV recording system was used in the transcription of my raw notes.