CLASSIFICATION  OF  THE  PUBLICATIONS  OF  THE  UNITED  STATES  GEOLOGICAL 
SURVEY. 
[Bulletin  No.  301.] 
The  serial  publications  of  the  United  States  Geological  Survey  consist  of  (1)  Annual 
Reports,  (2)  Monographs,  (3)  Professional  Papers,  (4)  Bulletins,  (5)  Mineral 
Resources,  (6)  VTater-Supply  and  Irrigation  Papers,  (7)  Topographic  Atlas  of 
United  States — folios  and  separate  sheets  thereof,  (8)  Geologic  AtJas  of  the  United 
States — folios  thereof.  The  classes  numbered  2,  7,  and  8  are  sold  at  cost  of  publica- 
tion; the  others  are  distributed  free.  A  circular  giving  complete  lists  can  be  had 
on  application. 
Most  of  the  above  publications  can  be  obtained  or  consulted  in  the  following 
ways: 
1 .  A  limited  number  are  delivered  to  the  Director  of  the  Survey,  from  whom  they 
can  be  obtained,  free  of  charge  (except  classes  2,  7,  and  8),  on  application. 
2.  A  certain  number  are  delivered  to  Senators  and  Representatives  in  Congress  for 
distribution. 
3.  Other  copies  are  deposited  with  the  Superintendent  of  Documents,  Washington, 
D.  C,  from  whom  they  can  be  had  at  practically  cost. 
4.  Copies  of  all  Government  publications  are  furnished  to  the  principal  public 
libraries  in  the  large  cities  thruout  the  United  States,  where  they  can  be  consulted 
by  those  interested. 
The  Professional  Papers,  Bulletins,  and  Water-Supply  Papers  treat  of  a  variety  of 
subjects,  and  the  total  number  issued  is  large.  They  have  therefore  been  classified 
into  the  following  series:  A,  Economic  geology;  B,  Descriptive  geology;  C,  System- 
atic geology  and  paleontology ;  D,  Petrography  and  mineralogy;  E,  Chemistry  and 
physics;  F,  Geography;  G,  Miscellaneous;  H,  Forestry;  I,  Irrigation;  J,  Water 
storage;  K,  Pumping  water;  L,  Quality  of  water;  M,  General  hydrographic  investi- 
gations; N,  Water  power;  O,  Underground  waters;  P,  Hydrographic  progress  reports. 
This  bulletin  is  the  thirtieth  in  Series  G,  the  complete  list  of  which  follows  (all  are 
bulletins  thus  far) : 
BULLETINS,  SERIES  G,  MISCELLANEOUS. 
2.  Gold  and  silver  conversion  tables,  giving  the  coining  values  of  troy  ounces  of  fine  metal,  etc., 
computed  by  Albert  Williams,  jr.    1883.    8  pp. 
7.  Mapoteca  geologica  Americana:  A  catalogue  of  geological  maps  of  America  (North  and  South), 
1752-1881,  in  geographic  and  chronologic  order,  by  Jules  Marcou  and  John  Belknap  Marcou. 
1884.  184  pp. 
25.  The  present  technical  condition  of  the  steel  industry  of  the  United  States,  by  Phineas  Barnes. 
1885.  85  pp. 
20.  Copper  smelting,  by  Henry  M.  Howe.     1885.     107  pp. 
44.  Bibliography  of  North  American  geology  for  1886,  by  Nelson  Horatio  Darton.    1887.    35  pp. 
75.  Record  of  North  American  geology  for  1887-1889,  inclusive,  by  Nelson  Horatio  Darton.     1891. 
173  pp. 
91.  Record  of  North  American  geology  for  1890,  by  Nelson  Horatio  Darton.    1891.    88  pp. 
99.  Record  of  North  American  geology  for  1891,  by  Nelson  Horatio  Darton.    1892.    73  pp. 
100.  Bibliography  and  index  of  the  publications  of  the  U.  S.  Geological  Survey,  1879-1892,  by  Philip 
Creveling  Warman.     1893.    495  pp. 
127.  Catalogue  and  index  of  contributions  to  North  American  geology,  1732-1891,  by  Nelson  Horatio 
Darton.     1896.     1,045  pp. 
130.  Bibliography  and  index  of  North  American  geology,  paleontology,  petrology,  and  mineralogy 
for  1892  and  1893,  by  Fred  Boughton  Weeks.    1896.    210  pp. 
I 
