Keywords: Plumbbob Laplace 003.jpg PLUMBBOB/LAPLACE - NTS The cloud from LAPLACE 18th full scale atomic detonation of the Summer 1957 test series begins to dissipate as it separates from the stem and rises to a height of about 19 500 feet 478 PLU-57-099 1957-09-08 Federal Government of the United States PD-USGov Plumbbob Laplace |