420         CONTRIBUTIONS   TO    ECONOMIC   GEOLOGY,    1907,    PART    II. 
Mineral  Resources  of  the  United  States,  1896.     Eighteenth  Ann.  Rept.,  pt.  5,  1897 
Coal,  by  E.  W.  Parker,  pp.  351-632;  Coke,  by  E.  W.  Parker,  pp.  659-746. 
Mineral  Resources  of  the  United  States,  1897.  Nineteenth  Ann.  Rept.,  pt.  6,  1898 
Coal,  by  E.  W.  Parker,  pp.  273-543;  Coke,  by  E.  W.  Parker,  pp.  545-642. 
Mineral  Resources  of  the  United  States,  1898.  Twentieth  Ann.  Rept.,  pt.  6,  1899 
Coal,  by  E.  W.  Parker,  pp.  295-507;  Coke,  by  E.  W.  Parker,  pp.  509-608. 
Mineral  Resources  of  the  United  States,  1899.  Twenty-first  Ann.  Rept.,  pt.  6,  1901 
Coal,  by  E.  W.  Parker,  pp.  321-519;  Coke,  by  E.  W.  Parker,  pp.  521-633. 
Mineral  Resources  of  the  United  States.  David  T.  Day.  Calendar  year  1900, 1901 
Coal,  by  E.  W.  Parker,  pp.  273-457;  Coke,  by  E.  W.  Parker,  pp.  459-536.  Calendar 
year  1901,  1902:  Coal,  by  E.  W.  Parker,  pp.  279-449;  Coke,  by  E.  W.  Parker,  pp.  451- 
523.  Calendar  year  1902,  1904:  Coal,  by  E.  W.  Parker,  pp.  289-447;  Coke,  by  E.  W. 
Parker,  pp.  449-515.  Calendar  year  1903,  1904:  Coal,  by  E.  W.  Parker,  pp.  351-538; 
Coke,  by  E.  W.  Parker,  pp.  539-608.  Calendar  year  1904,  1905:  Coal,  by  E.  W. 
Parker,  pp.  381-577;  Coke,  by  E.  W.  Parker,  pp.  579-648;  Peat,  by  H.  H.  Hindshaw, 
pp.  1229-1234.  Calendar  year  1905,  1906:  Coal,  by  E.  W.  Parker,  pp.  453-714;  Coke, 
by  E.  W.  Parker,  pp.  715-766;  Peat,  by  M.  R.  Campbell,  pp.  1319-1322.  Calendar 
year  1906,  1907:  Coal,  by  E.  W.  Parker,  pp.  563-753;  Coke,  by  E.  W.  Parker,  pp. 
754-809;  Peat,  by  M.  R.  Campbell,  pp.  1211-1212.  Calendar  year  1907,  1908:  Coal, 
by  E.  W.  Parker,  pt.  2,  pp.  5-222;  Coal  briquetting  in  1907,  by  E.  W.  Parker,  pt.  2, 
pp.  223-228;  Coke,  by  E.  W.  Parker,  pt.  2,  pp.  229-290. 
TECHNOLOGIC. 
Preliminary  report  on  the  operations  of  the  coal-testing  plant  of  the  United  States 
Geological  Survey  at  the  Louisiana  Purchase  Exposition,  St.  Louis,  Mo.,  1894,  E.  W. 
Parker,  J.  A.  Holmes,  M.  R.  Campbell,  committee  in  charge.  Bull.  No.  261,  1905. 
172  pp. 
Preliminary  report  on  the  operations  of  the  fuel-testing  plant  of  the  United  States 
Geological  Survey  at  St.  Louis,  Mo.,  1905.  J.  A.  Holmes,  in  charge.  Bull.  No.  290, 
1906.     240  pp. 
Report  on  the  operations  of  the  coal-testing  plant  of  the  United  States  Geological 
Survey  at  the  Louisiana  Purchase  Exposition,  St.  Louis,  Mo.,  1904.  E.  W.  Parker, 
J.  A.  Holmes,  M.  R.  Campbell,  committee  in  charge.  Prof.  Paper  No.  48,  1906.  (In 
three  parts.)     1492  pp. 
The  present  status  of  the  producer-gas  power  plant  in  the  United  States,  by  R.  II. 
Fernald.     Bull.  No.  316,  1907,  pp.  439-459. 
Condition  of  the  coal-briquetting  industry  in  the  United  States,  by  E.  W.  Parker. 
Bull.  No.  316,  1907,  pp.  460-485. 
The  importance  of  uniform  and  systematic  coal-mine  sampling,  by  J.  S.  Burrows. 
Bull.  No.  316,  1907,  pp.  486-517. 
Experimental  work  conducted  in  the  chemical  laboratory  of  the  United  States  fuel- 
testing  plant  at  St.  Louis,  Mo.,  by  N.  W.  Lord.     Bull.  No.  323,  1907.     49  pp. 
A  study  of  four  hundred  steaming  tests,  by  L.  P.  Breckenridge.  Bull.  No.  325,  1907. 
196  pp. 
Coal-mine  accidents:  their  causes  and  prevention,  by  Clarence  Hall,  W.  O.  Snelling, 
and  J.  A.  Holmes.     Bull.  No.  333,  1907.     21  pp. 
The  burning  of  coal  without  smoke  in  boiler  plants,  by  D.  T.  Randall.  Bull.  No. 
334,  1908.     26  pp. 
Washing  and  coking  tests  of  coal  and  cupola  tests  of  coke,  by  Richard  Moldenke, 
A.  W.  Belden,  and  G.  R.  Delamater,  with  introduction  by  J.  A.  Holmes.  Bull.  No. 
3°^.  1908.     76  pp. 
