Juan Dantín Gallego
Patrick Heffernan
Unknown Author
Pennsylvania Governor's Conference on Pneumoconiosis (Anthraco-Silicosis) Harrisburg 1964.
International Conference on Silicosis (3d 1969 Castellón, Spain)
United States. Division of Labor Standards
J. de V. Lambrechts
Hans Joachim Löblich
Emilio Sartorelli
F. Friehoff
Cato Broch
W. Watkins-Pitchford
International Conference on Silicosis, 3d, Castellón, Spain, 1969
Bergbau-Berufsgenossenschaft. Silikose-Forschungsinstitut.
C. T. Hardy
India. Office of the Chief Adviser, Factories.
François Malzac
Dwight Harshbarger