VIII 



ADVEETISEMKNT. 



21. Wells of Northern Indiana, by Frank Leverett. 1899. 8^. 82 pp. 2 pi. 



22. Sewage Irrigation, Part II, by George W. Rafter. 1899. 8^. 100 pp. 7 pi. 



23. Water-Eight Problems of Bighorn Mountains, by El wood Mead. 1899. 8^. 62 PP- 7 pl. 



24. Water Resources of the State of New York, Part I, by George W. Rafter. 1899. 8*^. 

 99 pp 13 pi 



25. Water Resources of the State of New York, Part 11, by George W. Rafter. 1899. 8°. 

 101—200 nn 1^ nl 



" 26. Wells'^of Southern Indiana (Continuation of No. 21), by Frank Leverett. 1899. S^. 64 pp. 



In press: 



27. Operations at River Stations, 1898, Part I. 1899. 8^. 100 pp. 



28. Operations at River Stations, 1898, Part II. 1899. 8°. 101-200 pp. 



In preparation: 



29. Wells and Windmills in Nebraska, by Edwin H. Barbour. 



30. Water Resources of the Lower Peninsula of Michigan, by Alfred C. Lane. 



TOPOGRAPHIC MAP OF THE UNITED STATES. 



When, in 1882, the Geological Survey was directed by law to make a geologic map of the United 

 States there was in existence no suitable topographic map to serve as a base for the geologic map. 

 The preparation of such a topographic map was therefore immediately begun. About one-fifth of the 

 area of the country, excluding Alaska, has now been thus mapped, The map is published in atlas 

 sheets, each sheet' representing a small quadrangular district, as explained under the next head- 

 ing. The separate sheets are sold at 5 cents each when fewer than 100 copies are purchased, but when 

 thev aie ordered in lots of 100 or more copies, whether of the same sheet or of different sheets, the 

 price is 2 cents each. The mapped areas are widely scattered, nearly every State being represented. 

 About 900 sheets have been engraved and printed; they are tabulated by States in the Survey^s 

 "List of Publications/^ a pamphlet which may be had on application. 



The map sheets represent a great variety of topographic features, and with the aid of descriptive 

 test they can be used to illustrate topographic forms. This has led to the projection of an educational 

 series of topographic folios, for use wherever geography is taught in high schools, academies, and 

 colleges. Of this series the first folio has been issued, viz : 



L Physiographic types, by Henry Gannett, 1898, foliOj consisting of the following sheets and 4 

 pages of descriptive text: Fargo (N. Dak.-Miun.), a region in youth; Charleston (W.Va.), a region in 

 maturity; Cafdwell (Kans.), a region in old agej Palmyra (Va.), a rejuvenated region; Mount Shasta, 

 (CaL), a young volcanic mountain; Eagle (Wis.), moraines; Sun Prairie (Wis.), drumlins; Donald- 

 sonville (La.)» river flood plains; Boothbay (Me.), a fiord coast; Atlantic City (N, J.), a barrier-beach 

 coast. 



GEOLOGIC ATLAS OP THE UNITED STATES. 



The Geologic Atlas of che 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 

 (designated q%mTanglm)f bounded by certain meridians and parallels. The unit of survey is also the 

 unit ot publication, aod 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 with textual 

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

 natural feature within the district. 



Two forms of issue have been adopted, a "library edition'^ and a "field edition." In both the 

 sheets are bound between heavy paper covers, but the library copies are permanently bound, while 

 the sheets and covers of the field copies are only temporarily wired together. 



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

 tions. The remainder are sold at 25 cents each, except such as contain an unusual amount of matter, 

 which are priced accordingly. Prepayment is obligatory. The folios ready for distribution are listed 

 below. 



No. 



1 



2 



B 

 i 

 5 

 6 

 7 

 8 

 9 



10 



Nawia of sheet. 



LiTingstoE 



Eingirold , 



Pla(»rville 



Ba»gstoii ...., 



Siacrai»ento 



CJjattonooga 



Pikes Peak (oat of stock) . 



Sewanee 



Anthracite-Crested Butt© 



Harpers Perry...* 



State. 



^, Montana....... 



f Georgia 



iTennessee 



California 



Tennessee 



California 



Tennessee 



Colorado 



Tennessee 



Colorado 



f Virginia.,...-, 

 ^ West Virginia. 

 iMaryland...... 



Limiting niendians. 



lioo-iuo 

 8o<=-85o 30' 



120O 30'-121o 

 84° 30'-85o 



12P~12P 30' 

 85o~85o 30' 



1050-105° 30' 



85° 30'-86o 



106O 45/_i07o 15' 



770 30'-78° 



Limiting parallels. 



450-460 

 340 30'-35o 



380 30'-39o 

 350 30'-36o 

 380 30'-39o 

 350-350 30' 

 380 30'-39o 

 350-350 30' 

 380 45/_39o 



390-390 30' 



A.rea, in 



square 



miles. 



3,354 



980 



932 

 969 

 932 

 975 

 932 

 975 

 465 



925 



Price, 

 in 



cents. 



25 



25 

 25 

 25 

 25 

 25 

 25 

 50 



25 



