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- Association of American Railroads 4
- The Engineering Experiment Station University of Illinois 4
- Cramer, R. E. 3
- American Iron and Steel Institute 2
- Jensen, R. S. 2
- Alleman, N.J. 1
- Copper Development Association 1
- French, David N. 1
- Great Britain. Ministry of Defence 1
- Haddon, J. D. 1
- Moore, Herbert F. 1
- Selwyn, Lyndsie 1
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