On the wings of the wind
Subtitle: in motorless planes, pilots ride in flying-fox fashion, cruising on upward air streams and lifted by the suction of moving clouds
By: by Howard Siepen ...
Publisher: National Geographic Society
Published: 1929
Place of publication: Washington
Language: eng
Number of pages: 480
Notes: Caption-title.

From the National Geographical Magazine v. 55, no. 6, June, 1929.