430         CONTRIBUTIONS   TO   ECONOMIC   GEOLOGY,    1907,    PART   II. 
PENNSYLVANIA. 
Anthracite  coal  mining,  by  II.  M.  Chance.  Mineral  Resources  U.  S.  for,  1883  and 
1884,  1885,  pp.  104-131. 
Stratigraphy  of  the  bituminous  coal  field  in  Pennsylvania,  Ohio,  and  West  Virginia, 
by  I.  C.  White.     Bull.  No.  65,  1891,  pp.  212. 
The  stratigraphic  succession  of  the  fossil  floras  of  the  Pottsville  formation  in  the 
southern  anthracite  coal  field ,  Pennsylvania,  by  David  White.  Twentieth  Ann.  Rept., 
pt.  2, 1900,  pp.  854-857. 
An  account  of  the  occurrence  of  the  Lykens  coals  in  Stony  Mountain  and  in  the  Dauphin  basin. 
The  Pennsylvania  anthracite  coal  field,  by  H.  H.  Stoek.  Twenty-second  Ann. 
Rept.,  pt.  3, 1902,  pp.  55-117. 
The  bituminous  coal  field  of  Pennsylvania,  by  David  White  and  M.  R.  Campbell. 
Twenty-second  Ann.  Rept.,  pt.  3,  1902,  pp.  127-200. 
Masontown-Uniontown  folio;  Pennsylvania,  description,  by  M.  R.  Campbell. 
Geologic  Atlas  U.  S.,  folio  82,  1902,  pp.  10-18. 
Gaines  folio,  Pennsylvania-New  York ;  description,  by  M.  L.  Fuller.  Geologic  Atlas 
U.  S.,  folio  92,  1903,  p.  9. 
Brownsville-Connellsville  folio,  Pennsylvania;  description,  by  M.  R.  Campbell. 
Geologic  Atlas  U.  S.,  folio  94,  1903,  pp.  11-17. 
Recent  work  m  the  bituminous  coal  field  of  Pennsylvania,  by  M.  R.  Campbell. 
Bull.  No.  213,  1903,  pp.  270-275. 
The  Barnesboro-Patton  coal  field  of  central  Pennsylvania,  by  J.  S.  Burrows.  Bull. 
No.  225,  1904,  pp.  295-310. 
The  Elders  Ridge  coal  field,  Pennsylvania,  by  R.  W.  Stone.  Bull.  No.  225,  1904, 
pp.  311-324. 
Coal  mining  along  the  southeastern  margin  of  the  Wilmore  basin,  Cambria  County, 
Pa.,  by  Charles  Butts.     Bull.  No.  225,  1904,  pp.  325-329. 
Indiana  folio,  Pennsylvania;  description,  by  G.  B.  Richardson.  Geologic  Atlas 
U.  S.,  folio  102,  1904,  pp.  4-6. 
Latrobe  folio,  Pennsylvania;  description,  by  M.  R.  Campbell.  Geologic  Atlas  U.  S., 
folio  110,  1904,  pp.  12-15. 
Kittanning  folio,  Pennsylvania;  description,  by  Charles  Butts.  Geologic  Atlas 
U.  S.,  folio  115,  1904,  pp.  12-13. 
Mineral  resources  of  the  Elders  Ridge  quadrangle,  Pennsylvania,  by  R.  W.  Stone. 
Bull.  No.  256,  1905.     Coal,  pp.  31-54.     Coke,  p.  55. 
Pittsburg  coal  in  the  Burgettstown  quadrangle,  Pennsylvania,  by  W.  T.  Griswold. 
Bull.  No.  260,  1905,  pp.  402-410. 
Waynesburg  folio,  Pennsylvania;  description,  by  R.  W.  Stone.  Geologic  Atlas  U.  S., 
folio  121,  1905,  pp.  9-10. 
Elders  Ridge  folio,  Pennsylvania;  description,  by  R.  W.  Stone.  Geologic  Atlas 
U.  S.,  folio  123,  1905,  pp.  7-9. 
Rural  Valley  folio,  Pennsylvania;  description,  by  Charles  Butts.  Geologic  Atlas 
U.  S.,  folio  125,  1905,  pp.  7-10. 
Ebensburg  folio,  Pennsylvania;  description,  by  Charles  Butts.  Geologic  Atlas 
U.  S.,  folio  133,  1905,  pp.  7-9. 
Beaver  folio,  Pennsylvania;  description,  by  L.  H.  Woolsey.  Geologic  Atlas  U.  S., 
folio  134,  1905 ;  pp.  11-12. 
Economic  geology  of  the  Kittanning  and  Rural  Valley  quadrangles,  Pennsylvania, 
by  Charles  Butts.     Bull.  No.  279,  1906.     Coal,  pp.  44-102. 
