THE HUNNIWELL BOYS AND THE PLATINUM MYSTERY #4 in series.
Edition: Early printing.
New York: A. L. Burt, (1928). Hardcover - The fourth book in this "thrilling aviation series for boys 12 to 16 years." Features Bill and Gordon Hunniwell, two enterprising and inventive young Americans who have many thrills in their new electric airplane. Five titles listed at front of book. Glossy frontispiece, 218 pp plus 6 pp publisher's ad.
Condition: Fair condition only in illustrated tan cloth (corners slightly bumped, missing front endpaper, tide mark to upper edge)