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Royal Society of London. Proceedings. . 1908. v.SoB, 

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Troost, Gerard, 1 776-1850, Dutch-American geologist. 



Popular science monthly. 1894. v.45, p. 258-264.. : . . .r 505 P81 v.45 



Youmans. Pioneers of science in America. 1896. p.i 19-127. .925 Y35 

 Trowbridge, John, b. 1843, American physicist. 



Popular science monthly. 1885. v.26, p. 836-839 r 505 P81 v.26 



Trowbridge, William Petit, 1828-92, American engineer. 



American Academy of Arts and Sciences. Proceedings. 1893. v.28, 

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American Society of Mechanical Engineers. Transactions. 1892. 

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National Academy of Sciences. Biographical memoirs. 1877-1909. 



V.3, p.363-367 r 925 N15 V.3 



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American Society of Civil Engineers. Transactions. 1896. v.36, 

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Tuckerman, Edward, 1817-86, American botanist. 



American Academy of Arts and Sciences. Proceedings. 1886. v.21, 

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National Academy of Sciences. Biographical memoirs. 1877-1909. 

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American Society of Civil Engineers. Transactions. 1905. v.54, 



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Miall. Early naturalists. 1912. p. 76-78 925.7 M66 



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American Society of Civil Engineers. Transactions. 1909. v.62, 

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Royal Society of London. Proceedings. 1879. v.29, 



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153 



