POP-UP. HOPALONG CASSIDY AND LUCKY AT THE DOUBLE X RANCH starring William Boyd based on characters by Clarence Mulford. NY:Garden City Pub (1950). 4to, thick photo illus. card covers, some rubbing, VG+. Illus. with 2 fine double-page pop-up figures and numerous color illus. by Jack Crowe. A great 50's item in excellent condition.