368  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,    1905. 
The  following  papers  contain  allusions  to  petroleum,  natural  gas,  and  asphalt,  and  ii 
some  cases  are  devoted  largely  to  the  consideration  of  these  products: 
Adams,  G.  I.,  Hawortii.  K.,  and  (ham:,  W.  R.  Economic  geology  of  the  Iola  quadrangle,  Kansas 
Bulletin  No.  238.    83  pp.    1904. 
Campbell,  M.  R.  Recent  work  in  the  bituminous  coal  field  of  Pennsylvania.  In  Bulletin  No.  213 
pp.  270-275.     1903. 
EldridGE,  G.  H.  A  geological  reconnaissance  in  northwest  Wyoming.  Bulletin  No.  119  72  pp 
1894. 
D  \kto\.  \.  11.  Preliminary  description  of  the  geology  and  water  resources  of  the  Black  Hills  am 
adjoining  regions  hi  South  Dakota  and  Wyoming.  In  Twenty-first  Ann.  Rept.,  pt.  4,  pp.  497-599.  1901 
— .  Preliminary  report  on  the  geology  and  underground  water  resources  of  the  central  Grea- 
Plains.    Professional  Paper  No.  32.    433  pp.    1905. 
Kindle,  E.  M.  Salt  and  other  resources  of  the  Watkins  Glen  quadrangle,  New  York.  In  Bulletii 
No.  260,  pp.567  572.     1905. 
Russell,  I.  C.  Notes  on  the  geology  of  southwestern  Idaho  and  southeastern  Oregon.  Bulletii 
No. 217.    83pp.     1903. 
Stone,  R.  W.  Mineral  resources  of  the  Elders  Ridge  quadrangle,  Pennsylvania.  Bulletin  NO. 256 
86  pp.     1905. 
The  following  folios  contain  references  to  oil,  gas,  and  asphalt:  Nos.  17,  40,  ,53,  64,  72, 
76,  82,  84,  92,  94,  98,  L02,  L05,  107,  110,  11.".,  L21,  123,  125. 
In  addition  to  the  references  given  to  the  mineral  resources  of  the  United  Stales,  those 
for  the  years  not  mentioned  will  be  found  to  contain  articles  on  oil,  natural  gas,  and  asphalt. 
The  latest  and  most  important  articles  have  been  cited. 
