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Popular science monthly. 1887. v.32, p.261-265 r 505 P81 v.32 



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American Society of Civil Engineers. Transactions. 1908. v.6i, 

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American Society of Civil Engineers. Proceedings. 1890. v.i6, 

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Bettany. Eminent doctors. 1885. v. 2, p. 52-55 926.1 B46 v.2 



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Royal Society of London. Proceedings. 1909. V.82A, 

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200 qr 506 G62 



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Royal Society of London. Proceedings. 1872. v.20, 

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 V.29, p.1145-1147 r 621.05 A5123 v.29 



Royal Society of London. Proceedings. 1910-11. V.84A, 

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American Academy of Arts and Sciences. Proceedings. 1889. v.24, 

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18 



