Johnson, George
John William Dawson
Consolidation Coal Company.
Unknown Author
Geological Survey (U.S.)
Rottermund, E. S. de comte
Edwin Gilpin
McLeod Stewart
Centre national de la recherche scientifique (France)
N. Berkowitz
Syd S. Peng
Richard Cowling Taylor
Clarence Karr
George Mercer Dawson
Armand Renier