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: Robert Maynard Pirsig (September 6, 1928 – April 24, 2017) was an American writer and philosopher.
i don't know