50 THE U. S. GEOLOGICAL SURVEY 



means of keeping the lists of producers up to date, the lists 

 are printed every year and distributed to persons familiar 

 with the industries for corrections and additions. 



In the preparation of its statistical reports for the last six 

 years, the Survey has worked in cooperation with a number of 

 the state geological surveys, the statistics thus collected being 

 used jointly by the state and federal surveys. This coopera- 

 tive agreement avoids annoyance to the producers by duplicate 

 requests for statistical information and insures more prompt 

 and more complete returns. Eighteen state surveys are now 

 cooperating in this way. 



"Mineral Resources of the United States," which for sev- 

 eral years has consisted of two volumes, is still the chief 

 medium through which information concerning the country's 

 mineral industries is made public. In addition to this annual 

 compilation and the more frequent shorter periodical statistical 

 statements given largely through the press, the Survey pub- 

 lishes from time to time a report on a particular mineral or 

 group of minerals from material obtained in the course of its 

 investigations. A type of these special compilations is a volume 

 published in 191 7, entitled, "Useful Minerals of the United 

 States," giving the location, by states and counties, of the 

 principal deposits of useful minerals, and a glossary showing 

 the composition and character of each mineral, the location of 

 its principal deposits and its chief uses. Among the more 

 technical compilations may be mentioned a 67-page pamphlet 

 on the "Antimony Deposits of Alaska," and a slightly larger 

 paper on "Tungsten Minerals and Deposits." The Survey 

 has also published from time to time in its reports special 

 maps showing the distribution of the deposits of particular 

 minerals. 



The Survey's various publications are supplemented by ex- 

 tensive correspondence with the general public. The Survey 

 is at all times ready to give available information to those 

 inquiring into the occurrence and utilization of mineral sub- 

 stances. In this connection the report of the Director for 



