Root Leon No more aching back : Dr. Root's new, 15-minute-a-day program for a healthy back / by Leon Root. - New York : Villard Books, 1990. - xxii, 215 p. : ill. ; 22 cm. ISBN: 0394587944 Subjects--Topical Terms: BackacheBackache--Exercise therapyBackache--Prevention LC Class. No.: WE720 Dewey Class. No.: 617.5/64