Improvement of visual aids for air navigation : progress report July 1, 1953 to February 28, 1954 / F.C. Breckenridge.
- Gaithersburg, MD : U.S. Dept. of Commerce, National Institute of Standards and Technology, 1954.
- Government document
1 online resource.
- NBS report ; 3185.
NBS report ; 3185
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