364  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,   1903.  [bull. 225. 
Nineteenth  Ann.  Kept.,  pt.  3,  pp.  423-600.     1898. 
Preliminary  report  on  the  Camden  coal  field  of  southwestern  Arkansas. 
In  Twenty-first  Ann.  Kept.,  pt.  2,  pp.  313-329.     1900. 
The  Southwestern  coal   field    [Indian   Territory,  Arkansas,  Texas].     In 
Twenty-second  Ann.  Kept.,  pt.  3,  pp.  367-414.     1902. 
Taff  J.  A.,  and  Adams,  G.  I.  Geology  of  the  eastern  Choctaw  coal  field,  Indian 
Territory.     In  Twenty-first  Ann.  Rept.,  pt.  2,  pp.  257-311.     1900. 
Vaughan,  T.  W.  Reconnaissance  in  the  Rio  Grande  coal  field  of  Texas.  Bulletin 
No.  L64.     LOO  pp.     1900. 
Weeks,  J.  D.  The  manufacture  of  coke.  In  Mineral  Resources  TJ.  S.  for  1883-84, 
pp.  144-213.     1885. 
White,  D.  The  bituminous  coal  field  of  Maryland.  In  Twenty-second  Ann. 
Rept.,  pt.  3,  pp.  201-214.     1902. 
White,  D.,  and  Campbell,  M.  R.  The  bituminous  coal  field  of  Pennsylvania. 
In  Twenty-second  Ann.  Rept.,  pt.  3,  pp.  127-200.     1902. 
White.  I.  C.  Stratigraphy  of  the  bituminous  coal  field  of  Pennsylvania,  Ohio, 
and  West  Virginia.     Bulletin  No.  65.     212  pp.     1891. 
Willis,  B.  The  lignites  of  the  Great  Sioux  Reservation  [Dakota].  Bulletin  No. 
21.     16  pp.     1885. 
Some  coal  fields  of  Puget  Sound   [Washington].     In  Eighteenth  Ann. 
Rept.,  pt,  3,  pp.  393-436.     1898. 
Woodworth,  J.  B.  The  Atlantic  coast  Triassic  coal  field  [Virginia,  North  Caro- 
lina].    In  Twenty-second  Ann.  Rept.,  pt.  3,  pp.  25-54.     1902. 
