As James Gleick notes in his excellent biography of Feynman, Genius: The Life and Science of Richard Feynman, nearly all of Feynman's work originated in the spoken word. While Gleick provides a bibliography of some of Feynman's work in Genius, it is known that there is no one authoritative bibliography of his work. The present paper, as is often the case, is not recorded in Glieck's bibliography or elsewhere that we can see, however, Feynman does mention the talk briefly in "Surely You're Joking Mr. Feynman!":

"In Canada they have a big association of physics students. They have meetings; they give papers, and so on. One time the Vancouver chapter wanted to have me come and talk to them. The girl in charge of it arranged with my secretary to fly all the way to Los Angeles without telling me. She just walked into my office. She was really cute, a beautiful blonde. (That helped; it's not supposed to, but it did.) And I was impressed that the students in Vancouver had financed the whole thing. They treated me so nicely in Vancouver that now I know the secret of how to really be entertained and give talks: Wait for the students to ask you." (Richard Feynman, "Surely You're Joking Mr. Feynman!" p. 343).