By Stanley Chernicoff, Ramesh Venkatakrishnan
By Brian J. Skinner, Stephen C. Porter
By Dorothy Merritts, etc., Andrew deWet (Franklin Marshall College, USA), Kirsten Menking (Vassar College
By Harvey Blatt, Ernest G. Ehlers, Robert Tracy, Robert Tracy (Virginia Polytechnic Institute, USA)
By A. J. Parsons, P.G. Knight
By Michael Stone, Zenobia Barlow
By Hettie Judah
By Matthew Hedman
By D. Flinn, British Geological Survey
By James G. Carrier