According to Bob Spitz, author of The Beatles: The Biography, it was Bob Dylan who first introduced the Fab Four to marijuana.
Rolling Stone article about Dylan's receiving the Presidential Medal of Freedom
Bob Dyland and Tom Petty on the mic
BooksForKidsBlog: Words Make Meaning: Man Gave Names to All the Animals by Bob Dyland and Jim Arnovsky
Larry Hinds is a singer for hire and acoustic guitarist for weddings and other events. He performs classics from the 60s and 70s by The Beatles, Bob Dyland and others.
Highway 61 Revisited: Bob Dyland's Road From Minnesota to the World – Minnesota Historical Society
Bob Dylan - studio 1965
Aprentice and mentor, Bob Dyland and Victoria Spivey