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Collection
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Maker
- Colhoun, David 19
- American Technical Society 10
- Dyke, A. L. 7
- Manly, Harold P. 6
- American School of Correspondence 5
- Teletype Corporation 5
- The Engineering Experiment Station University of Illinois 5
- Toboldt, William King 5
- Webster-Chicago 5
- Association of American Railroads 4
- Bell and Howell Limited 4
- Caterpillar Tractor Company 4
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