Radiobeacons and radiobeacon navigation
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Radiobeacons and radiobeacon navigation
U.S. G.P.O., 1931
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At head of title: U.S. Department of commerce. R.P. Lamont, secretary. Lighthouse service. George R. Putnam, commissioner
"July 1, 1931"
"A small pamphlet, Radio fog signals and their use in navigation in connection with the radiocompass, was published by the Lighthouse service in 1921, and was also included in the Annual report for that year; this was revised and published separately in 1924, under the same title, The present publication is a revision of these."--P. 1