I would like to acknowledge the following people who provided help and assistance in the preparation of this book. Bob Falls provided support on some of the text and photographs as well as the analysis of the meteorite database. Fred Olsen supplied a number of photographs and, together with Chauncey Walden, Ugo Hiddema and Paul Botha, gave much help with the text. John Kashuba provided the spectacular photographs from various thin sections and Dorothy Norton kindly helped direct me to sources of photographs and useful web sites. Last, but not least, Prof. Bruce Cairncross made available all his photographs and Riana Swart helped with many of the figures and diagrams.