Det danske Fredsakademi
Kronologi over fredssagen og international politik 4. Juli 1957 / Time Line July 4, 1957
Version 3.0
07/04/1957
Operation
Plumbbob
Amerikansk
atmosfærisk
atomvåbenforsøg i Nevada.
Kilde:
United States Nuclear Tests, July 1945 through September
1992. 
U.S. Department of Energy Nevada Operations Office, DOE/NV--209-REV
15, December 2000.
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