PHOSPHATES  AND  OTHER  MINERAL  FERTILIZERS. 
PUBLICATIONS  ON  PHOSPHATES,  ETC. 
The  following  papers  relative  to  phosphates,  gypsum  (land  plas- 
ter), and  other  mineral  materials  used  as  fertilizers  have  been  pub- 
lished by  the  United  States  Geological  Survey  or  by  members  of 
its  staff.  Further  references  will  be  found  under  the  head  of  "  Gyp- 
sum "  in  the  list  on  page  586  of  this  volume. 
Adams,  G.  I.,  and  others.  Gypsum  deposits  in  the  United  States.  Bulletin 
U.  S.  Geol.  Survey  No.  223,  127  pp.     1904. 
Darton,  N.  H.  Notes  on  the  geology  of  the  Florida  phosphates.  In  Am. 
Jour.  Sei.,  3d  series,  vol.  41,  pp.  102-105.     1891. 
Eckel,  E.  C.  Recently  discovered  extension  of  Tennessee  white  phosphate 
field.     In  Mineral  Resources  U.  S.  for  1900,  pp.  812-813.     1901. 
-  Utilization  of  iron  and  steel  slags.     In  Bulletin  U.   S.  Geol.   Survey 
No.  213,  pp.  221-231.     1903. 
-  The  white  phosphates  of  Decatur  County,  Tenn.     In  Bulletin  U.   S. 
Geol.  Survey  No.  213,  pp.  424-425.     1903. 
Eldridge,  G.  H.  A  preliminary  sketch  of  the  phosphates  of  Florida.  In 
Trans.  Am.  Inst.  Min.  Eng.,  vol.  21,  pp.  196-231.     189:5. 
Hayes,  C.  W.  The  Tennessee  phosphates.  In  Sixteenth  Ann.  Rept.  U.  S. 
Geol.  Survey,  pt.  4,  pp.  610-630.     1895. 
-  The  Tennessee  phosphates.     In   Seventeenth  Ann.   Rept.   U.   S.   Geol.j 
Survey,  pt.  2,  pp.  1-38.     1896. 
-  The   white   phosphates    of   Tennessee.     Trans.    Am.    Inst.    Min.    Eng.,; 
vol.  25,  pp.  19-28.     1896. 
-  A  brief  reconnaissance  of  the  Tennessee  phosphate  field.     In  Twen- 
tieth Ann.  Rept.  U.  SI  Geol.  Survey,  pt.  6,  pp.  633-638.     1899. 
-  The  geological  relations  of  the  Tennessee  brown  phosphates.     In  Sci- 
ence, vol.  12,  p.  1005.     1900. 
-  Tennessee  white  phosphate.     In  Twenty-first  Ann.  Rept.  U.   S.  Geoll 
Survey,  pt.  3,  pp.  473-485.     1901. 
Origin  and  extent  of  the  Tennessee  white  phosphates.     In   Bulletin] 
U.  S.  Geol.  Survey  No.  213,  pp.  418-423.     1903. 
Ihlseng,  M.  C.  A  phosphate  prospect  in  Pennsylvania.  In  Seventeenth! 
Ann.  Rept.  U.  S.  Geol.  Survey,  pt.  3,  pp.  955-957.     1896. 
Memminger,   C.   G.     Commercial   development  of  the  Tennessee  phosphates. 
In  Sixteenth  Ann.  Rept.  U.  S.  Geol.  Survey,  pt.  4,  pp.  631-635.     1895. 
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