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Archives» Vols. xviii: N° 12; xix: No« 1, 2, 4 á 10. 

 » American Pililos opliical Society. 



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Bulletin. Vol. i: N^'^ 2, 3 (1898). 

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Vol. i: N° 2; Geol. VoL i: No« 2, 3. 

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 Washington. — National Academy of Sciences. 

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