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This first volume explores Elvis's youth, up until age 24, when he is inducted into the army. Guralnick is a respected cultural historian, and this two-volume work is the definitive Elvis biography.
This second volume picks up where Last Train to Memphis leaves off, and follows Presley through his death in 1977. Again, this two-volume work is the definitive biography.
If you are interested more in the "inside" story from a person with a unique attachment to Presley, you might like this older book from his young bride.