606  INDEX    TO    PUBLICATIONS    OF    IT.    S.    GEOL.    SURVEY,      [bull.  177. 
Pennsylvania;   Pottsville  formation  in  southern  anthracite  coal  field,  strati- 
graphic  succession  of  fossil  floras  of Ann  20,  n,  pp  749-930 
quartz  from,  statistics  of Ann  19,  vi  cont,  p  657; 
Ann  20,  vi  cont,  p  745;  Ann  21,  vi  cont,  p  595 
rocks  of,  their  classification,  etc Bull  80,  pp  42,  83-112,  124-125,  131,  260-261 
salt  from,  statistics  of MR  1882,  pp  532-534  ;  MR  1883-84,  pp 
835,  836;  MR  1892,  pp  794,  799;  MR  1893,  pp  719,  721,  726; 
Ann  16,  iv,  pp  647,  648,  649,  655;  Ann  17,  in  cont,  pp  985, 
986,  987,  990,  991;  Ann  18,  v  cont,  pp  1274,  1275,  1276,  1277, 
1280,  1281;  Ann  19,  vi  cont,  p  588  et  seq;  Ann  20,  vi  cont, 
pp  670,  671,  676,  677,  678;  Ann  21,  vi  cont,  p  534  et  seq 
sandstone  production  of MR  1882,  p  451;  MR  1888,  p  545;  MR  1889-90, 
pp  374,  419;  MR  1891,  pp  461,  463;  MR  1892,  p  710;  MR 
1893,  p  553;  Ann  16,  iv,  pp  437,484,485,486,491;  Ann  17, 
in  cont,  pp  760,  775,  776,  777,  778,  780;  Ann  18,  v  cont, 
pp  951,  1012,  1013,  1014,  1025-1043;  Ann  19,  vi  cont,  pp 
207,  264,  265,  266,  277-278;  Ann  20,  vi  cont,  pp  271,  336, 
337,  338,  341;    Ann  21,  vi  cont,  pp  335,  353,  354,  355,  356 
Schuylkill  River,  flow  of,  measurements  of Ann  20, 
iv,  pp  48,  88,  96-97;  WS  35,  pp  74-75 
profile  of WS  44,  p  17 
sections,  geologic,  in.     (See  Section,  geologic,  in  Pennsylvania.) 
sewage-disposal  plants  in WS  22,  pp  72-74 
slate  production  of,  statistics  of MR  1882,  p  542;  MR  1885,  p  399; 
MR  1887,  p  522;  MR  1888,  p  547;  MR  1889-90,  pp  376,  424; 
MR  1891,  pp  472,  473;  MR  1892,  p  710;  MR  1893,  pp  550, 
551;  Ann  16,  iv,  pp  437,  476,  477,  478-480;  Ann  17,  in  cont, 
pp  760,  770,  771,  772,  773,  774;  Ann  18,  v  cont,  pp  951,992, 
994,  995,  996,  997,  1000-1001;  Ann  19,  vi  cont,  pp  207,  250, 
251,  252,  253,  254,  256-263;  Ann  20,  vi  cont,  pp  271,  294,  295, 
296,  297,  298,  299,  300;  Ann  21,  vi  cont,  pp  335,  344-349,  352 
soapstone  production  of. Ann  20,  vi  cont,  p  552;  Ann  21,  vi  cont,  p  414 
South  Mountain,  pre-Cambrian  rocks  of Ann  16,  i,  pp  837-838 
survey  of,  by  cooperation  of  State Ann  20,  i,  pp  98, 110 
Susquehanna  River,  flow  of,  measurements  of Ann  19,  iv, 
pp  122-127;  Ann  20,  iv,  pp  48, 109-110;  Ann  21,  iv,  pp  87-92; 
WS  15,  pp  8-11 ;  WS  27,  pp  17,  23,  24;  WS  35,  pp  75-79,  80-81 
profile  of WS  44,  pp  17-19 
timber  in,  estimates  of Ann  19,  v,  p  16 
Tohickon  Creek,  flow  of,  measurements  of Ann  20,  iv, 
pp  48,  98-103;  Ann  21,  iv,  pp  83-85;  WS  35,  p  64 
topographic  maps  of.      (See  Map,  topographic,  of  Pennsylvania;  also  list 
on  p  92  of  this  bulletin. ) 
topographic  work  in Ann  10,  i,  pp  87,  89;  Ann  11,  i, 
p  36;  Ann  12,  i,  p  26;  Ann  13,  i,  p  71;  Ann  14,  i,  p  171;  Ann 
16,  i,  pp  64,  68,  69;  Ann  18,  i,  pp  94,  96, 102;  Ann  19,  i,  pp  89, 
91,  98;  Ann  20,  i,  pp  101, 102, 110;  Ann  21,  i,  pp  118, 123-125 
triangulation  in Bull  122,  pp  50-63 
wells  in Bull  138,  pp  115-117 
Wellersburg  coal  basin,  extent  and  production  of Ann  14,  n,  p  578 
Wissahickon  Creek,  flow  of,  measurements  of Ann  20, 
iv,  pp  48,  94-96;  Ann  21,  iv,  pp  81-82;  WS  35,  p  74 
woodland  area  in Ann  19,  v,  p  4 
zinc  and  zinc  works  in Ann  2, 
p  xxix;  MR  1882,  pp  361-365,  373;  MR  1883-84,  p  476 
