Gillum
Nelson, Jack
Graham Wootton
Tom Truman
Rainer Tölle
Frédérick E. Grasser-Hermé
W. S. Morrow
Erber.
Energy Institute (Great Britain). Technical Team
Raymond S. Bradley
Carl L. Yaws
Victoria Wise
Hernán Rodríguez Fisse
Patrick Rivers
Unknown Author
Gordon Korman
D. G. Beevers
Wyn Grant
Ullrich Meier
Anthony J. Nownes