Tex Book Tenor is an album by American jazz saxophonist Booker Ervin featuring the last performances Ervin recorded as a leader in 1968 for the Blue Note label. The session was first released in 1976 as a double LP Back from the Gig combined with a 1964 session recorded under Horace Parlan's leadership (released in 1988 as Happy Frame of Mind) and finally released in 2005 on CD.