18  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1904.        [bull.  26(1 
6.  Mineral  Resources  of  the  United  States. — From  1883  to  1894, 
inclusive,  an  octavo  cloth-bound  volume  bearing  the  above  title  was 
issued  annually,  except  that  the  reports  for  the  years  1883-84:  and 
1889-90  were  included  by  pairs  in  single  volumes.  The  first  of  this 
series  was  Mineral  Resources  of  the  United  States,  1882;  the  last, 
Mineral  Resources  of  the  United  States,  1893.  In  1894  this  form  of 
publication  was  discontinued,  in  accordance  with  an  act  of  Congress, 
and  the  statistical  material  was  included  in  certain  parts  of  the  six- 
teenth, seventeenth,  eighteenth,  nineteenth,  twentieth,  and  twenty- 
first  annual  reports.  The  separate  publication  of  the  series  on  min- 
eral resources  wras  resumed,  however,  in  1901,  in  accordance  with 
an  act  of  Congress,  and  four  volumes  of  the  new  series,  Mineral 
Resources  of  the  United  States  for  1900,  for  1901,  for  1902,  and  for 
1903  have  been  issued. 
This  publication  contains  a  systematic  statement  of  the  production 
and  value  of  the  mineral  products  of  the  United  States,  a  summary  of 
new  mineral  resources  developed,  and  occasional  short  papers  on 
economic  geology,  when  these  may  be  necessary  to  account  for  the  new 
developments. 
