I can't really think of an encyclopedia- or overview-type history of rock n roll that I could recommend. Just haven't read any.
That said, I would definitely recommend all of Peter Guralnick's books. His books cover everything from rock n roll to soul and country. His two-volume biography of Elvis Presley is particularly good.
• (1971). Feel Like Going Home: Portraits in Blues, Country, and Rock 'n' Roll.
• (1979). Lost Highway: Journeys & Arrivals of American Musicians.
• (1986). Sweet Soul Music: Rhythm and Blues and the Southern Dream of Freedom.
• (1989). Searching for Robert Johnson.
• (1994). Last Train to Memphis: The Rise of Elvis Presley.
• (1999). Careless Love: The Unmaking of Elvis Presley.
• (2005). Dream Boogie: The Triumph of Sam Cooke.
• (2015). Sam Phillips: The Man Who Invented Rock'n'Roll.