Padfield, R. Randall. , Learning to fly helicopters / R. Randall Padfield. - 2nd ed. - xxii, 521 pages : illustrations ; 24 cm. ISBN: 9780071808613 0071808612 Subjects--Topical Terms: Helicopters--Piloting--Handbooks, manuals, etc. LC Class. No.: TL716.5 / .P32 2014