424         CONTRIBUTIONS   TO   ECONOMIC  GEOLOGY,   1907.   PAKT   TT. 
Walsenburg  folio,  Colorado;  description,  by  R.  C.  Hills.  Geologic  Atlas  U.  S.,  folio 
68,  1900,  pp.  4-5. 
Spanish  Peaks  folio,  Colorado;  description,  by  R.  C.  Hills.  Geologic  Atlas  U.  S., 
folio  71,  1901,  pp.  4-6. 
The  Rocky  Mountain  coal  fields,  by  L.  S.  Storrs.  Twenty-second  Ann.  Rept.,  pt.  3, 
1902,  pp.  415-471. 
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. 
The  Yampa  coal  field,  Routt  County,  Colo.,  by  N.  M.  Fenneman  and  H.  S.  Gale. 
Bull.  No.  285,  1906,  pp.  226-239. 
The  Durango-Gallup  coal  field  of  Colorado  and  New  Mexico,  by  F.  C.  Schrader. 
Bull.  No.  285,  1906,  pp.  241-258 
The  Yampa  coal  field,  Routt  County,  Colorado,  by  N.  M.  Fenneman  and  H.  S.  Gale. 
With  a  chapter  on  the  character  and  use  of  the  Yampa  coals  by  M.  R.  Campbell. 
Bull.  No.  297,  1906.     96  pp. 
Coal  fields  of  the  Danforth  Hills  and  Grand  Hogback,  in  northwestern  Colorado,  by 
H.  S.  Gale.     Bull.  No.  316,  1907,  pp.  264-301. 
The  Book  Cliffs  coal  field  between  Grand  River,  Colo.,  and  Sunnyside,  Utah,  by 
G.  B.  Richardson.     Bull.  No.  316,  1907,  pp.  302-320. 
The  Durango  coal  district,  Colorado,  by  J.  A.  Taff.  Bull.  No.  316,  1907,  pp.  321- 
337. 
A  reconnaissance  survey  of  the  western  part  of  the  Durango-Gallup  coal  field  of 
Colorado  and  New  Mexico,  by  M.  K.  Shaler.     Bull.  No.  316,  1907,  pp.  376^26. 
Ouray  folio,  Colorado;  description,  by  Whitman  Cross,  Ernest  Howe,  and  J.  D. 
Irving.     Geologic  Atlas  U.  S.,  folio  153,  1907.     Coal,  by  Whitman  Cross,  p.  19. 
Coal  fields  of  northwestern  Colorado  and  northeastern  Utah,  by  H.  S.  Gale.  Bull. 
No.  341,  1909,  pp.  283-315. 
The  Grand  Mesa  coal  field,  Colorado,  by  W.  T.  Lee.     Bull.  No.  341, 1909,  pp.  316-334. 
Reconnaissance  of  the  Book  Cliffs  coal  field,  by  G.  B.  Richardson.  Bull.  No.  371, 
L909.     53  pp. 
GEORGIA. 
Ringgold  folio,  Georgia-Tennessee;  descriptive  text,  by  C.  W.  Hayes.  Geologic 
/itlas  U.  S.,  folio  2,  1894. 
Stevenson  folio,  Alabama-Georgia-Tennessee;  description,  by  C.  W.  Hayes.  Geo- 
logic Atlas  U.  S.,  folio  19,  1895. 
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 
IDAHO. 
Boise  folio,  Idaho;  description,  by  Waldemar  Lindgren.     Geologic  Atlas  U.  S.,  folio 
45,  1898. 
The  Rocky  Mountain  coal  fields,  by  L.  S.  Storrs.     Twenty-second  Ann.  Rept.,  pt. 
3,  1902,  pp.  415-473. 
ILLINOIS. 
Danville  folio,  Illinois-Indiana;  description,  by  M.  R.  Campbell.  Geologic  Atlas 
U.  S.,  folio  67,  1900,  pp.  6-7. 
The  eastern  interior  coal  field,  by  G.  H.  Ashley.  Twenty-second  Ann.  Rept.,  pt.  3, 
1902,  pp.  2C.5-305. 
An  account  of  the  cool  field  embracing  parts  of  Indiana,  Illinois,  and  Kentucky.  # 
