United States. General Accounting Office
M. N. Nabighian
B. S. Rama Rao
William C. Overstreet
J. W. Joyce
Richard I. Gibson
Unknown Author
Guodong Liu
A. P. Ivanov
Soviet Union. Ministerstvo geologii.
José Kostadinoff
G. V. Molochnov
A. I͡A Sidorin
V. I. Pavlovskiĭ
Antonov, I͡U. N.
Knut Åm
W. P Hasbrouck