J. D. Smith
James F. Carlin
Francis Barclay Allan
Stephen M. Jasinski
A. M. Andriesh
Hongzhe Sun
Franklin H. Persse
Imperial Institute, London. Mineral Resources Department.
Alojz Chura
United States. National Bureau of Standards.
James F Carlin
Unknown Author
Richard Wright Vian
Samuel W. Moore
Ludwig Moser
Wilfred P. Moran
Herman Simon Riederer
L. Jaenicke