Provenance Photo source NOAA photo library http://www.photolib.noaa.gov/
Wea01108, Early launch of radiosonde developed by U.S. Bureau of Standards. Launch preparations at Washington Airport blimp hangar. Washington, D.C. May 7, 1936. Freely available for re-publication or re-use with attribution.
Reuse This item is in the public domain
and maybe reused freely without restriction.