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26 



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Trautwine, John C. 4. On the field practice 



of laying out circular curves for railroads. 



Franklin Inst. Journ. XXI., 1851, pp. 361 



379. 

 5. A new method of calculating the cubic 



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 6. Practical rule for finding the thickness 



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7. Rough notes of an exploration for an 



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9. Remarks on force, motion, and inertia. 



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. 2. Notice sur un grand nivellement exe- 



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