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REPORT ON NATIONAL MUSEUM, 1886. 



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Mineralogy of Pennsyl- 

 vania, preliminary re- 

 port, 1874, p. 116. 



Mineralogy of Pennsyl- 

 vania, preliminary re- 

 port, 1874, p. 116 (Brash). 



Geology of Vermont, Vol. 

 II, p. 779. 







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