Keywords: Trinity Test Mushroom Cloud 3s.jpg en Trinity Test - Alamogordo NM - July 16 1945 The mushroom cloud starts to form at 3 0 seconds http //www atomicarchive com/Photos/Trinity/image13 shtml atomicarchive com Federal government of the United States 1945-07-16 PD-USGov Trinity test Mushroom clouds Black and white photographs of the United States |