Impact Cratering Links
The "official" count of terrestrial impact craters, with statistics and pictures.
Declassified nuclear test films. These tests helped us understand impact cratering processes.
Further Reading Impact Cratering, by H. Jay Melosh, QB603.C7.M451 1989 Earth Science Library, an advanced treatment of cratering mechanics Traces of Catastrophe, by Bevan French, QE475.A2.F74 1998 Earth Science Library. Good introduction to cratering processes and evidence.