VIII ADVERTISEMENT. 
In preparation: 
19. Irrigation near Merced, California, by C. i. Grunsky. 
20. Experiments with Windmills, by T. O. Perry. 
21. Wells of Indiana, by Frank Leverett. 
22. Sewage Irrigation, Part Il, by George W. Rafter. 
23. Water-Right Problems of Bighorn Mountains, by Elwood Mead. 
24. Water Resources of the State of New York, Part I, by George W. Rafter. 
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 following head- 
ing. The separate sheets are sold at 5 cents each when fewer than 100 copies are purchased, but when 
they are 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. 
More than 800 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 
text 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: 
1. Physiographic types, by Henry Gannett, 1898, folio, consisting of the following sheets and 4 
pages of descriptive text: Fargo (N. Dak.-Minn.), a region in youth; Charleston (W.Va.), a region in 
maturity ; Caldwell (Kans.), aregion in old age; Palmyra (Va.), a rejuvenated region; Mount Shasta, 
(Cal.), a young volcanic mountain; Hagle (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 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 
(designated quadrangles), bounded by 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 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. Prepaymentis obligatory. The folios ready for distribution are listed 
helow. 
Area, in |Price, 
No. Name of sheet. State. Limiting meridians. Limiting parallels. square in 
miles. |cents. 
1 | Livingston --.--.-------------- Montana....---- 1109-1119 45°-46° 3, 354 25 
j Georgia. ..- ri 50. Oo U oO 2804 {eo} 
2 | Ringgold -....-----.----------- Manncssoal 85°-85° 30 34° 30/-35' 980 25 
8 | Placerville..--.----------.-.._- California. - 120° 30/-121° 380 30/-390 932 95 
4 | Kingston... ....--- .--| Tennessee 84° 30/-85° 35° 30/360 969 25 
5 | Sacramento----.-- -| California 1219-121° 30/ 38° 30/-39° 932 25 
6 | Chattanooga..----- ---- Tennessee 85°-85° 30/ 359-35° 30/ 975 25 
7 | Pikes Peak (out of stock) - .| Colorado. 1059-1059 30/ 380 30/390 | - 932 25 
8 | Sewanee..--.--.-------- -| Tennessee 85° 30/-86° 359-35° 30! 975 25 
9 | Anthracite-Crested Butt 4 Colorado: 106° 45/1079 15/ 380 45/390 465 50 
irginia - A 
10 | Harpers Perry----------------- {west Virginia -. | 77° 30/-78° 390-390 30! 925 25 
Maryland.....-- 
Tal || URGE 5 - seconde ssoscoescecc California. ------ 120° 30/-121° 38°-38° 30/ 938 25 
Virginia ...--.-- 
12'| Estillville --------------------- {entice Soquese 82° 80/830 36° 30/-37° 957 95 
Tennessee ------ 
13 | Fredericksburg......--...----- Heeeoeree eee, 710-179 30! 389-380 30 938 | 25 
Vivginia ..------ + 
q148) |] Starvin tone eee eee tweet Vue. } 79°-79° 30! 380-38° 30! 938 | 25 
15) || assentPeak:------ - es sae= = i= California-....-.- 1219-1229 400410 3, 634 25 
16}| Knox villosa eee (North Garolina |} 830 30-840 a5° 30-360 | 925 | 25 
