FOR    THE    YEARS    1901-1905,   INCLUSIVE.  345 
Villasenor  (F.). 
1.  Anarisis  de  las  cenizas  de  la  eruption  del  volcan  de  Santa  Maria  (Guatemala), 
ocurrida  el  24  de  octubre  de  1902,  recogidas  en  Comitan. 
Secretaria  de  Fomento  [Mexico],  Bol.,  2a6p.,  afio  2,  no.  7,  II,  pp.  279-280,  1903. 
Discusses  the  composition  of  cinders  ejected  by  the  volcano  of  Santa  Maria  in  Guatemala. 
Vog-des  (Anthony  W.). 
1.  A  bibliography  relating  to  the  geology,  paleontology,  and  mineral  resources  of 
California. 
Cal.  State  Mg.  Bur.,  Bull.  no.  30,  pp.  7-258,  1904. 
2.  Address  on  books  relating  to  geology,  mineral  resources,  and  paleontology  of  Cal- 
ifornia. 
San  Diego  Soc.  Nat.  Hist.,  vol.  1,  no.  1,  pp.  9-23,  1905. 
Vog-t  (J.  H.  L.). 
1.  Problems  in  the  geology  of  ore-deposits. 
Am.  Inst.  Mg.  Engrs.,  Trans.,  vol.  31,  pp.  125-169,  1902. 
Discusses  genesis  of  ore  deposits. 
Von  Rosenberg"  (Leo). 
1.  Report  on  the  properties  of  the  Summit  Coal  Company,  situated  in  Marshall 
County,  State  of  West  Virginia. 
New  York,  12  pp.,  9  pis.,  1903.     (Privately  printed.) 
Contains  geologic  sections  of  Carboniferous  strata  and  data  bearing  on  coal  production. 
Voyle  (Joseph). 
1.  Aurite,  and  a  general  theory  of  gold  ore  genesis. 
Mg.  &  Sci.  Press,  vol.  86,  pp.  382-383,  1903. 
w. 
Wag-enen  (T.  H.  van). 
1.  Nitrate  deposits,  Humboldt  County,  Nevada. 
Mg.  &  Sci.  Press,  vol.  84,  p.  63,  1902. 
Brief  description  of  occurrence. 
Wagner  (George). 
1.  Observations  on  Platygonus  compressus  Le  Conte. 
Jour.  Geol.,  vol.  11,  pp.  777-782,  4  figs.,  1903. 
2.  On  an  interesting  fossil  Unio  from  Wisconsin. 
Nautilus,  vol.  18,  pp.  97-100,  1  pi.,  1905. 
Walcott  (Charles  D.). 
1.  Cambrian  Brachiopoda;    Obolella,  subgenus   Glyptias;   Bicia;    Obolus,  subgenus 
Westonia;  with  description  of  new  species. 
U.  S.  Nat.  Mus.,  Proc,  vol.  23,  pp.  669-695,  1901. 
2.  The  work  of  the  United  States  Geological  Survey  in  relation  to   the  mineral 
resources  of  the  United  States. 
Am.  Inst.  Mg.  Engrs.,  Trans.,  vol.  30,  pp.  3-26,  with  map,  1901. 
Gives  a  general  account  of  the  work  of  the  U.  S.  Geological  Survey  in  the  development  of  the 
mineral  resources  of  the  country. 
3.  Twenty-second  Annual  Report  of  the  Director  of  the  United  States  Geological 
Survey  to  the  Secretary  of  the  Interior,  1900-1901. 
U.  S.  Geol.  Surv.,  22d  Ann.  Rept.,  pt.  1,  pp.  1-207,  24  pis.,  1901. 
Gives  an  account  of  the  work  of  the  U.  S.  Geological  Survey  for  the  year. 
4.  Sur  les  formations  pr£-Cambriennes  fossiliferes. 
Intern.  Cong.  Geol.,  Compte  Rendu,  viii  session,  pp.  299-312, 1901. 
Describes  the  lithologic  and  faunal  characters  of  the  pre-Cambrian  strata  in  various  parts  of 
the  United  States. 
