ADVERTISEMENT. 



WATER SUPPLY AND IRRIGATION PAPERS. 



By act of Congress approved June 11, 1806, the fol 1 owing provision was made: 



f* Provided^ That hereafter the reports of the Geological Survey in relation to the ganging of 

 Btreams and to the methods of utilizing the water ivsimrees may be j.iiii ed in oela\o form, not to 

 exceed one hundred paves in length and five thousand copies in number; one thousand copies of which 

 shall be for the official use of the Geological Survey, one thousand fn «■ hundred copies shall be deliv- 

 ered to the Senate, and two thousand live hundred copies shall be delivered to the House of Repre- 

 sentatives, for distribution." 



Under this law the following paper is in press: 



1. Pumping Water for Irrigation, by Herbert M. Wilson. 



GEOLOGIC ATLAS OF THE UNITED .STATES. 



The Geologic Atlas of the United States is the final form of publication of the topographic and 

 geologic maps. The atlas is issued in parts, progressively as the surveys are extended, and is designed 

 ultimately to cover the entire country. 



Under the plan adopted the entire area of the country is divided into small rectangular districts. 

 bounded t>> certain meridians and parallels. The unit of survey is also the unit of publication, and 

 the maps and descriptions of each rectangular district are issued as a folio of the Geologic Atlas. 



Each folio contains topographic, geologic, economic, and structural maps, together \\ ith textual 

 descriptions and explanations, and is designated by the name of a principal towu or of a prominent 

 natural feature within the district. 



Two forms of issue have been adopted: A library edition, bound between heavy paper covers 

 and stitched; and afield edition, similarly bound, but unstitched. 



Under the law a copy of each folio is sent to certain public libraries and educational institu- 

 tions. A limited number of copies are reserved for distribution to persons specially interested in the 

 region represented. This distribution is at iirst gratuitous, but when the remaining number of copies 

 Of any folio reaches a certain minimum a charge equivalent to cost of publication will be made. In 

 such eases prepayment is obligatory. The folios ready for distribution are listed below. 



Ringgold* 



Placerville* 



Kingston* 



Sacramento' 



Chattanooga* 



Pikes Peak* 



Sewanee* 



Anthracite- ('rested Butte* 



10 Harpers Ferry* 



Estillville 



Fredericksburg . 

 Staunton* 



California. 

 Tennessee . 

 < lalifornia . 

 Tennessee . 

 Colorado. .. 



Colorado 



{Virginia 

 West Virgini; 

 Maryland 



California — 



i Virginia 

 Kentucky. ... 

 Ti 



f Maryland 



\Yirginia 



(Virginia 



Aw est Virginia. . 

 Lassen Peak" ; California 



(North < Carolina . 



California 



California 



Kuoxrille* . 



{Alabama... 

 Tennessee . 



Tennessee . 

 Tennessee . 

 Tennessee . 

 jMarvliinil . 

 I Virginia ... 



Three Forks : Montana. . 



Loudon Tennessee . 



Poca] ^' s !«,:,":-, 



Mnrristmvn Tennessee . 



Stevenson* . . 

 Cleveland*. .. 



PikeviUe* ... 



MoMinnville* 



Nomini 



110°-111° 



| 85°-85° 30' 



120° 30'-121° 



84° 30'-B5° 



121°-121° 30' 



85°-85° 30' 



105°-105° 30' 



85° 30'-86° 



106° 45'-107° 15' 



77° 30'-78° 



79°-79° 30' 



1213-122 

 83° 30'-84° 



85°-85° 30' 



s;, :;n< m; 



81°-81° 30' 

 83°-83° 30' 



45°-46° 

 34° 30'-35° 

 38° 30'-39° 

 35° 30'-36° 

 38° 30'-39° 

 35°-35° 30' 

 38° 30'-39° 

 35°-35° 30' 

 38° 45'-39° 



39°-39° 30' 



38°-38° 30' 



38°-38° 30' 

 40°-41° 



35° 30'-36° 



35°-35° 30' 

 35° 30'-36° 



35= 30'-36= 



37°-37° 30' 

 36°-36° 30' 



•These folios i :an now- be sent only on prepayment of price stated in tut- last column. 



