In what year was Robert M. Pirsig's most famous book first published?
Zen and the Art of Motorcycle Maintenance: Zen and the Art of Motorcycle Maintenance: An Inquiry into Values (ZAMM), by Robert M. Pirsig, is a book that was first published in 1974. Robert M. Pirsig:  He was the author of the philosophical novels "Zen and the Art of Motorcycle Maintenance: An Inquiry into Values" (1974) and "" (1991).
i don't know