FOR    THE    YEARS    1901-1905,   INCLUSIVE.  217 
Ledoux  (A.  R.). 
1.  Notes  on  the  Oregon  nickel  prospects. 
Can.  Mg.  Rev.,  vol.  20.  pp.  84-85,  1901;  Can.  Mg.  Inst.  Jour.,  vol.  4,  pp.  184-189,  1901. 
Describes  the  geological  relations  of  the  ore  bodies  and  gives  a  chemical  analysis  of  the  ore. 
2.  The  production  of  copper  in  the  Boundary  district,  B.  C. 
Can.  Mg.  Inst.  Jour.,  vol.  5,  pp.  171-177,  1902;  Mg.  &  Sci.  Press,  vol.  84,  p.  307,  1902. 
Describes  the  character  and  occurrence  of  the  ores. 
Lee  (Harry  A.). 
1.  Colorado:  Report  of  the  State  Bureau  of  Mines,  Denver,  U.  S.  A.     For  the  years 
1901-2. 
Denver,  1903.    310  pp.,  map. 
Gives  a  history  of  precious  metal  mining  by  counties  in  Colorado,   with  notes  upon  the 
geologic  occurrence,  production,  etc.,  of  precious  metals  and  other  minerals. 
Lee  (Leslie  A.). 
1.  The  mineral  resources  of  Maine. 
Am.  Mg.  Cong.,  7th  Ann.  Sess.,  Rept.  of  Proa,  pp.  227-232,  1905. 
Lee  (Willis  Thomas). 
1.  The  Morrison  formation  of  southwestern  Colorado. 
Jour.  Geol.,  vol.  9,  pp.  343-352,  4  figs.,  1901. 
Describes  the  character  and  occurrence  of  the  Jurassic  and  Cretaceous  strata  of  the  res-ion, 
and  discusses  the  stratigraphic  and  paleontologic  evidences  of  the  age  of  the  Morrison 
formation. 
2.  The  areal  geology  of  the  Castle  Rock  region,  Colorado. 
Am.  Geol.,  vol.  29,  pp.  90-110,  1  pi.,  1902. 
Describes  the  occurrence   and   character  of  the  sedimentary  and  igneous  rocks  and  th 
geologic  structure  of  the  region. 
3.  The  Morrison  shales  of  southern  Colorado  and  northern  New  Mexico. 
Jour.  Geol.,  vol.  10,  pp.  36-58,  7  figs.,  1902. 
Describes  the  general  structure  of  the  region,  gives  detailed  sections  and  discusses  the  age 
and  equivalency  of  the  shales. 
4.  Canyons  of  southeastern  Colorado. 
Jour.  Geog.,  vol.  1,  pp.  357-370,  12  figs.,  1902. 
Includes  sections  of  the  strata  cut  by  some  of  the  canyons  described. 
5.  Note  on  the  Carboniferous  of  the  Sangre  de  Cristo  Range,  Colorado. 
Jour.  Geol.,  v<  1.  10,  pp.  393-396,  1902. 
Gives  a  detailed  section  in  the  Sangre  de  Cristo  Range  and  a  list  of  the  fossils  collected. 
6.  The  canyons  of  northeastern  New  Mexico. 
Jour.  Geog.,  vol.  2,  pp.  63-82,  14  figs.,  1903. 
Includes  sections  of  the  strata  cut  by  some  of  the  canyons  described  and  gives  a  general 
account  of  the  formations  exposed. 
7.  Age  of  the  Atlantosaurus  beds. 
Abstract:. Science,  new  ser.,  vol.  17,  pp.  292-293,  1903;  Geol.  Soc.  Am.,  Bull.,  vol.  14,  pp.  531-532, 
1904. 
8.  The  underground  waters  of  Gila  Valley,  Arizona. 
IT.  S.  Geol.  Surv.,  Water-Supply  and  Irrigation  Paper  no.  104,  68  pp.,  5  pis.,  -9  figs.,  1904. 
Includes  sections  of  wells  showing  thickness  and  character  of  strata  passed  through. 
9.  Underground  waters  of  Salt  River  Valley,  Arizona. 
U.  S.  Geol.  Surv.,  Water  Supply  and  Irrigation  Paper  no.  136,  196  pp.,  23  pis.,  25  figs.,  1905. 
Includes  an  account  of  the  geology  and  physiography  of  the  region 
10.  Note  on  the  glacier  of  Mount  Lyell,  California. 
Jour.  Geol.,  vol.  13,  pp.  358-362,  2  figs.,  1905. 
Leffingwell  (E.  D.  K.),  Capps  (S.  R.)  and. 
1.  Pleistocene  geology  of  the  Sa watch  Range,  near  Leadville,  Colo. 
See  Capps  (S.  R.)  and  LeffingweU  (E.  D.  K.),  1. 
