SURVEY  PUBLICATIONS  ON  SULPHUR  AND   PYRITE. 
The  list  below  includes  the  important  publications  of  the  United  States  Geological  Survey 
on  sulphur  and  pyrite: 
Adams,  G.  I.  The  Rabbit  Hole  sulphur  mines,  near  Humboldt  House,  Nov.  In  Bulletin  No.  225, 
pp.  497-500.     1904. 
Davis,  II.  J.     Pyrites.    In  Mineral  Resources  U.  S.  for  1885.  pp.  501-517.    1886. 
Eckel,  E.  C.  Gold  and  pyrite  deposits  of  the  Dahlonega  district,  Georgia.  In  Bulletin  No.  213, 
pp.  57-63.     1903. 
■     Pyrite  deposits  of  the  Eastern  Adirondack^,  N.  Y.     In  Bulletin  No.  200,  pp.  587-588.     1905. 
Martin,  W.     Pyrites.     In  Mineral  Resources  U.  S.  for  1883-84,  pp.  877-905.     L886. 
Richardson,  G.  B.     Native  sulphur  in  El  Paso  County.  Tex.     In  Bulletin  No.  260,  pp.  589-592.  1905. 
ROTHWELL,  R.  P.     Pyrites.     In  Mineral    Resources  U.  S.  for  1886,  pp.  650-675.     1887. 
Spurr,  J.  E.  Alum  deposit  near  Silver  Peak,  Esmeralda  County,  Nev.  In  Bulletin  No.  225, 
pp.  501-502.     1904. 
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