Cornelis Klein
R. F. Symes
W. A. Deer
Johann Wolfgang von Goethe
John Michael Wallace-Hadrill
Richard Spilsbury
Harvey Blatt
John W. Anthony
M. H. Battey
Daniel S. Wilks
Richard E. Ernst
Yoshiki Oshida
Dennis L. Hartmann
Cook, David C. Dr.
Eduard Josef Gübelin
International Geological Congress (30th 1996 Beijing, China)
William Nesse
Ulrich Sebastian
Chris Oxlade
Cornelis Klein, Anthony R. Philpotts