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- 57060204 contributor B1379423.
- 57060204 created "1957.".
- 57060204 date "1957".
- 57060204 date "1957.".
- 57060204 dateCopyrighted "1957.".
- 57060204 description "Bibliography: p. 273-278.".
- 57060204 extent "viii, 278 p.".
- 57060204 issued "1957".
- 57060204 issued "1957.".
- 57060204 language "eng".
- 57060204 publisher "Washington, U.S. Dept. of Commerce, National Bureau of Standards,".
- 57060204 subject "QC100 .U555 no. 582".
- 57060204 subject "Sporadic E (Ionosphere)".
- 57060204 title "Worldwide occurrence of sporadic E.".
- 57060204 type "text".