7. U. S. Geological Survey Bulletin, No. 660, “Manganese Deposits of the Caddo Gap-De Queen Quadrangles of Arkansas," by H. D. Miser. (Out of print.)*

8.

9.

10.

11.

U. S. Geological Survey Bulletin, No. 326, "The Arkansas Coal
Fields," by A. J. Collier. (Out of print.)*

U. S. Geological Survey Folio, No. 154, "Winslow Geologic
Folio." (Out of print.)*

U. S. Geologic Survey Folio, No. 119, "Fayetteville Geologic
Folio." (Out of print.)*

U. S. Geological Survey Folio, No. 202, "Eureka Springs-Har-
rison Geologic Folio." (Obtainable from U. S. Geological Sur-
vey, Washington, D. C., for 25c.)

12. U. S. Geological Survey Folio, No. 202, "Eureka Springs-Harrison Geologic Folio." (Obtainable from U. S. Geological Survey, Washington, D. C., for 25c.)

13. Arkansas Geological Survey Annual Report for 1890, Vol. IV, "Marbles and Other Limestones," by T. C. Hopkins. (Obtainable from Arkansas Geological Survey, 446 State Capitol Building, Little Rock, Ark. For postage charges see table on another page.)

14.

Arkansas Geological Survey Annual Report for 1892, Vol. V, "The Zinc and Lead Region of North Arkansas, by J. C. Branner. (Obtainable from Arkansas Geological Survey, 446 State Capitol Building, Little Rock, Ark. For postage charges see table on another page.)

15. U. S. Geological Survey Bulletin, No. 690, "Gravel Deposits of Caddo Gap-De Queen Quadrangles," by H. G. Miser and A. H. Purdue. (Out of print.)*

SOIL SURVEYS

The accompanying soil survey index map shows the counties and portions of Arkansas where soil surveys have been completed by the Bureau of Soils of the U. S. Department of Agriculture.

Detailed soil surveys have been made of sixteen counties in the State and of the Fayetteville and Stuttgart areas. A general soil reconnaissance has been made of the Ozark region and that part of the State north of the Arkansas River and west of the Coastal Plain shore line.

A bulletin containing a description of all the soils of the State together with a State soil map has been issued by the Agricultural Experiment Station of the University of Arkansas and deals with the different classes of soils found in the State, their crop possibilities and fertilizer treatment. This is Bulletin No. 187, "The Soils of Arkansas," by M. Nelson. W. H. Sachs and R. H. Austin, and may be obtained on request from the Agricultural Experiment Station, Fayetteville, Ark.

*May be consulted in Library of Arkansas Geological Survey, or in public libraries.

Soil Survey Bulletins

1. Soil Survey of the Fayetteville Area.

2. Reconnaissance Survey of the Ozark Region.

3. Soil Survey of Craighead County, by E. B. Deeter.

SURVEYED

4. Soil Survey of Mississippi County, by E. C. Hall, T. M. Bushnell, L. V. Davis, W. T. Carter, Jr., and A. L. Patrick.

5. Soil Survey of Pope County, by Clarence Lounsbury and E. B. Deeter.

6. Soil Survey of Conway County, by James L. Burgess and C. W. Ely.

7. Soil Survey of Faulkner County, by E. B. Deeter.

8.

Soil Survey of Yell Couny, by E. B. Deeter.

9. Soil Survey of Perry County, by E. B. Deeter.

10. Soil Survey of Prairie County, by W. T. Carter, Jr., F. N. Meeker, H. C. Smith and E. L. Worthen.

11. Soil Survey of the Stuttgart Area, by J. E. Lapham.
12. Soil Survey of Jefferson County, by B. W. Tillman.
13. Soil Survey of Howard County, by M. W. Beck.
14. Soil Survey of Hempstead County, by A. E. Taylor.
15. Soil Survey of Drew County, by B. W. Tillman.

16. Soil Survey of Miller County, by J. O. Martin.

17.

Soil Survey of Columbia County, by Clarence Lounsbury. 18. Soil Survey of Ashley County, by E. S. Vanatta, B. D. Gilbert,

E. B. Watson and A. H. Meyer.

19. Soil Survey of Lonoke County, by E. W. Knobe, C. Lounsbury, L. V. Davis, E. D. Fowler and A. W. Goke.

As a usual thing, reports of not more than three separate areas and not exceeding one copy of each report are sent free to one individual. If more than three reports of separate areas are wanted, they should be purchased from the Superintendent of Documents, Government Printing Office, Washington, D. C., at the following figures: 1902. Arkansas County (see Stuttgart area).

1913. Ashley County, 15 cents.

1914. Columbia County, 15 cents.
1907. Conway County, 15 cents.
1916. Craighead County, 15 cents.
1917. Drew County, 15 cents.
1917. Faulkner County, 15 cents.
1916. Hempstead County, 15 cents.
1917. Howard County, 15 cents.
1915. Jefferson County, 15 cents.
1921. Lonoke County, 25 cents.

1903. Miller County.

1914. Mississippi County, 15 cents.

1920. Perry County, 15 cents.

1913. Pope County, 15 cents.

1902. Stuttgart Area (part of Arkansas County), 15 cents. 1915. Yell County, 15 cents.

The editions of the following Soil Survey Reports are exhausted for free distribution. They are included in the "Field Operations of the Bureau of Soils" for the years indicated, which may be consulted at the libraries as shown on the attached sheet or at a number of other principal public libraries throughout the United States. These reports also may be purchased from the Superintendent of Documents, Government Printing Office, Washington, D. C., at the prices indicated, with the exception that where no price is shown they are impossible of purchase except in the bound volumes of the Field Operations of the Bureau of Soils:

1906. Benton County (see Fayetteville Area).

1906. Fayetteville Area (parts of Benton and Washington Counties).

1906. Prairie County, 15 cents.

1906. Washington County (see Fayetteville Area).

1911. As shown on the Soil Survey map.

The following Soil Surveys are in progress in the field, or in course of preparation by the printer and lithographer, and will be available for distribution later:

The streams of Arkansas, as estimated by the Interior Department, may be used to generate 125,000 horse power available 90 per cent of the time, and 178,000 horse power available 50 per cent of the time.

Mr. William Crooks of the Crooks Engineering Corporation, estimates the available primary and secondary horse power of the streams which may be used to generate major power in northwest Arkansas as follows:

At the present time four hydro-electric plants are operating in the State, as follows:

The Remmel dam is used to supplement the load requirements of the Arkansas Power & Light Company. Three 3500 KW generators are installed. This company plans to erect two more dams on the Ouachita River to operate in connection with the Remmel dam. The three dams are expected to give practically complete control of the Ouachita River and generate 62,000 primary and 100,000 secondary KW when all three are operating.

The estimated power generated per year in Arkansas follows:

Assuming that these four dams generate 21,000,000 KWH per year, and that the value at the switchboard is lc per KWH, the value of the electrical power generated in Arkansas during 1926 was approximately $210,000.00.