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Unknown Author
United States. International Trade Administration. Capital Goods and International Construction Sector Group
United States. Bureau of the Census
United States International Trade Commission.
League of Nations. Secretariat. Economic and Financial Section.
Guizhou sheng di fang zhi bian zuan wei yuan hui
Andrew Ure
Canada. Industry, Science and Technology Canada.
W. Durst
Don Nelson
United States
Shigen Gijutsu Shikenjo (Japan)
William R. Haycraft
L. D. Borisenko
Fraser & Chalmers
G.S. Wormer & Sons