Young, Warren R. The helicopters / [electronic resource] / by Warren R. Young and the editors of Time-Life Books.. — Alexandria, Va. : : Time-Life Books,, c1982.. — 175 p. : : ill. (some col.) ; 29 cm. - The Epic of flight. Includes index. Bibliography: p. 172. ISBN: 0809433508 0809433516 (lib. bdg.) 0809433532 (pbk.) LCCN: 82010740 Subjects--Topical Terms: Helicopters. LC Class. No.: TL716 / .Y65 1982 Dewey Class. No.: 629.133/352