SURVEY    PUBLICATIONS   ON    GYPSUM,   SALT,  BORAX,  ANI 
SODA. 
The  more  important  publications  of  the  United  Slates  Geological  Survey  on  the  natu- 
ral lime,  sodium,  and  potassium  salts  included  in  this  group  are  the  following: 
Adams,  G.  I.,  and  others.    Gypsum  deposits  of  the  United  States.    Bulletin  No.  223.    123  pp.    1904. 
Boutwell,  J.  M.    Rockgypsumal  Nephi,  Utah.     En  Bulletin  No.  225,  pp.  483-487.    1904. 
c  impbell,  M.  K.  Reconnaissance  of  the  borax  deposits  of  Death  Valley  and  Mohave  Desert.  Bul- 
let in  No.  200.    23  pp.    1902. 
Borax  deposits  of  eastern  California.     In  Bulletin  No.  213,  pp.  401-405.     1903. 
CHATARD,  T.  M.  Salt-making  processes  in  the  United  States.  In  Seventh  Ann.  Kept.,  pp.  491-535. 
1888. 
Darton,  X.  II.     Zufii  salt  deposits,  New  Mexico.     In  Bulletin  No.  200.  pp.  505-566.    1905. 
Day,  W.  C.     Potassium  salts,     [n  Mineral  Resources  U.  S.  for  1887,  pp.  628-650.    1888. 
-  Sodium  salts.     In  Mineral  Resources  U.  S.  for  1887,  pp.  651-658.    1888. 
Eckel,  E.  C.  Salt  and  gypsum  deposits  of  southwestern  Virginia.  In  Bulletin  No.  213,  pp.  406- 
416.    1903. 
-  Salt  industry  of  Utah  and  California.     In  Bulletin  X...  225,  pp.  488-495.    1904. 
Hilgard,  E.  W.    The  salines  of  Louisiana.     In  Mineral  Resources  U.  S.  for  1882,  pp.  554-565.    1883. 
Kindle,  E.  M.  Salt  resources  of  the  Watkins  Glen  district.  New  York.  In  Bulletin  No.  260,  pp. 
567-572.     1905. 
Ortox,  E.    Gypsum  or  land  plaster  in  Ohio.     In  Mineral  Resources  U.  S.  for  1887,  pp.  506  601.    ISS8. 
Pai  kard,  R.  I..     Natural  sodium  salts.    In  Mineral  Resources  \  .  S.  for  L893,  pp.  728-738.    1894. 
Richardson.  G.  B.  Salt,  gypsum,  and  petroleum  in  trans-Pecos,  Texas.  In  Bulletin  No.  2(9 
pp.  573  585.     1.905. 
Yale,  C.  G.    Bora*.    In  Mineral  Resources  U.  S.  for  1839-189:),  pp.  494-500.    1902. 
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