422         CONTRIBUTIONS   TO   ECONOMIC   GEOLOGY,   1907,   PART   II. 
Coal  fields  of  the  United  States,  by  C.  W.  Hayes.     Bull.  No.  213,  1903,  pp.  257-269. 
A  general  account  of  the  distribution  and  geologic  relations  of  the  coal  fields,  and  the  classification 
and  marketing  of  coals. 
Lignites  of  the  middle  and  upper  Missouri  Valley,  by  E.  F.  Burehard.  Bull.  No. 
225,  1904,  pp.  276-288. 
Describes  the  occurrence  and  character  of  lignite  deposits  in  Dakota  County,  Nebraska,  and  in  North 
Dakota. 
Preliminary  report  on  the  geology  and  underground  water  resources  of  the  central 
Great  Plains,  by  N.  H.  Darton.     Prof.  Paper  No.  32,  1905,  pp.  372-379. 
Gives  a  general  account  of  the  occurrence  of  coal  in  Colorado,  Wyoming,  South  Dakota,  and 
Nebraska. 
Field  work,  by  M.  R.  Campbell.     Bull.  No.  261,  1905,  pp.  18-29. 
Field  work,  by  M.  R.  Campbell.     Prof.  Paper  No.  48,  pt.  1,  1906,  pp.  156-173. 
Survey  work  on  coal  during  1905,  by  M.  R.  Campbell.  Bull.  No.  285,  1906,  pp. 
203-210. 
Gives  a  short  account  of  geologic  work  on  coal  areas  in  1905,  of  the  work  of  the  fuel-testing  division, 
and  of  the  classification  of  coals. 
Contributions  to  economic  geology,  1906,  pt.  2.  Coal,  lignite,  and  peat,  by  M.  R. 
Campbell  and  others.     Bull.  No.  316,  1907.     542  pp. 
Classified  list  of  papers  dealing  with  coal,  coke,  lignite,  and  peat,  contained  in  publi- 
cations of  U.  S.  Geol.  Survey,  by  W.  T.  Lee  and  J.  M.  Nickles.  Bull.  No.  316,  1907, 
pp.  518-532. 
Map  of  coal  fields  of  the  United  States,  by  Marius  R.  Campbell,  1908. 
Gives  areas,  production,  and  estimated  original  tonnage  of  coal  fields 
Contributions  to  economic  geology,  1907,  pt.  2.  Coal  and  lignite,  by  M.  R.  Camp- 
bell and  others.     Bull.  No.  341,  1909. 
ALABAMA. 
The  coal  measures  of  Alabama,  by  E.  A.  Smith.  Mineral  Resources  U.  S.  for  1892, 
1893,  pp.  293-300. 
Stevenson  folio,  Alabama-Georgia-Tennessee,  description,  by  C.  W.  Hayes.  Geo- 
logic Atlas  U.  S.,  folio  19,  1895. 
Gadsden  folio,  Alabama,  description,  by  C.  W.  Hayes.  Geologic  Atlas  U.  S.,  folio 
35,  1896. 
The  southern  Appalachian  coal  field,  by  C.  W.  Hayes.  Twenty-second  Ann.  Rept., 
pt.  3,  1902,  pp.  227-263. 
An  account  of  the  stratigraphy,  distribution,  and  character  of  the  coals  of  the  Jellico,  Chattanooga, 
and  Birmingham  districts  embracing  parts  of  Kentucky,  Tennessee,  Georgia,  and  Alabama. 
The  Warrior  coal  basin  in  the  Brookwood  quadrangle,  Alabama,  by  Charles  Butts. 
Bull.  No.  260,  1905,  pp.  357-381. 
The  Warrior  coal  basin  in  the  Birmingham  quadrangle,  Alabama,  by  Charles  Butts. 
Bull.  No.  285,  1906,  pp.  211-222. 
The  northern  part  of  the  Cahaba  coal  field,  Alabama,  by  Charles  Butts.  Bull. 
No.  316,  1907,  pp.  76-115. 
ARIZONA. 
Report  of  work  done  in  the  division  of  chemistry  and  physics  mainly  during  the 
fiscal  year  1884-85.     Bull.  No.  27,  1886,  p.  74. 
Gives  analyses  of  coal  from  Deer  Creek  Valley,  Ariz. 
The  Deer  Creek  coal  field,  Arizona,  by  M.  R.  Campbell.  Bull.  No.  225,  1904,  pp. 
240-258. 
