wabman.]  COKE COLORADO.  241 
Colombia,  platinum  from,  character  of Ann  16,  in,  pp  630,  631 
Color,  temper-value,  and  time  of  exposure,  relation  between,  in  oxide  films  on 
steel Bull  27,  pp  51-61 
Color  effect  produced  by  slow  oxidation  of  iron  carbonates Bull  35,  pp  51-60 
Color  scheme  for  geologic  cartography Ann  2, 
pp  xlix-lii;  Ann  7,  p  105;  Ann  10,  i,  pp  69-79 
Colors  and  conventional  symbols  adopted  for  geologic  maps  and  sections Ann  10, 
i,  pp  67-79 
Colorimetric  estimation  of  small  amounts  of  chromium,  with  special  reference 
to  the  analysis  of  rocks  and  ores Bull  167,  pp  37-43 
Colorado,  altitudes  in.      (See  "elevations,"  under  this  State.) 
Animas  River,  flow  of,  measurements  of Ann  18,  iv,  pp  283-285; 
Ann  19,  iv,  pp  414-415;  Ann  20,  iv,  pp  59,  403;  Ann  21, 
iv,  p  301;  Bull  140,  pp  198-200;  WS  11,  p  72;  WS  16. 
p  146;   WS  28,  pp  139,   142,    145;    WS  38,  pp  310-311 
profile  of Bull  44,  p  85 
Animas  Valley,  glaciation  of Mon  xxxrv,  pp  340-343 
Anthracite  and  Crested  Butte  quadrangles,  geology  of GF  9 
Arkansas  River,  flow  of,  measurements  of inn  1 1,  n,  pp  95-96,  97,  98; 
Ann  12,  n,  pp  240,  242,  349,  360;  Ann  13,  in,  pp  19,  21, 
94,  99;  Ann  14,  n,  pp  106-110;  Ann  18,  iv,  pp  224-231; 
Ann  19,  iv,  pp  351-358;  Ann  20,  iv,  pp  56-57,  330-339; 
Ann  21,  iv,  pp  229-235;  Bull  131,  pp  34-40;  Bull  140, 
pp  153-160;  WS  11,  pp  60-61;  WS  16,  pp  117-122;  WS 
28,   pp  110-112,  113,  114,  116,  117;   WS  37,  pp  257-264 
irrigation  problems  relating  1<>  basin  of Ann  11,  n,  pp  210-214 
irrigation  system  of  ( rreal  Plains  Water  Company  in  valley  of Ann  21, 
iv,  pp  240-243 
mapping  of,  and  surveying  of  reservoir  sites  in Ann  13,  in,  pp  429-444 
profile  of WS  44,  pp  63-65 
surveys  for  reservoir  sites  along Ann  11,  n,  pp  133-144 
Aspen  mining  district,  geology  of Mon  xxxi 
Aspen  and  West  Aspen  mountains,  mines  of Mon  xxxi,  pp  151-167 
asphalt  deposit  and  production  of Ann  18,  v  cont,  pp  935-945; 
Ann  19,  vi  cont,  pp  190,  194;  Ann  20,  vi  cont, 
PP  254,  277;  Ann  21,  vi  cont,  pp  321,  323-324 
atlas  sheets  of.     (See  pp  70-71  of  this  bulletin. ) 
Battlement  Mesa  Forest  Reserve,  rep.  >rt  on Ann  20,  v,  pp  181-243 
Bear  Creek,  -flow  of,  measurements  of Ann  18, 
iv,  pp  167-169;  Ann  19,  iv,  p  317;  Ann  20,  iv,  pp  54, 
284-285;  Ann  21,  iv,  p  204;  Bull  140,  pp  106-107;  WS  11, 
p  54;  WS  15,  p  90;  WS  27,  pp  81,  86;  WS  37,  pp  227-228 
Big  Thompson  Creek,  flow  of,  measurements  of  .Ann  13,  in,  pp  89,  93;  Ann  18,  iv, 
pp  174-175;  Ann  19,  iv,  pp  321-322;  Ann  20,  iv,  pp  55,  288- 
289;  Ann  21,  iv,  pp  209-210;  Bull  140,  pp  110-112;  WrS  11, 
p  56;  WS15,  p  94;  WS  27,  pp  83,  86,  89;  WTS37,  pp  233-234 
Blue  Mountains,  geology  of Ann  17,  n,  p  439 
rocks  of Ann  17,  n,  pp  277,  278,  279,  280,  281 
Boulder,  geologic  structure  of  region  about Mon  xxvn,  pp  105-111 
Boulder  Creek,  flow  of,  measurements  of Ann  13, 
in,  pp  87,  93;  Ann  18,  iv,  pp  169-172;  Ann  19,  iv,  pp 
318-320;  Ann  20,  iv,  pp  54,  286-288;  Ann  21,  iv,  pp 
206-208;  Bull  140,  pp  107-109;  WS  11,  pp  54-55;  WS 
15,  pp  91-92;  WS  27,  pp  82,  86,  89;  WS  37,  pp  229-231 
Bull.  177—01 16 
