14 PRICE LIST 46 TTH EDITION 



PHOSPHATES Continued. 



Review of phosphate fields of Idaho, Utah, and Wyoming, with special ref- 

 erence to thickness and quality of deposits. 1910. 48 pages, map. Paper, 

 lOc. A 26.3 : 69 



See also, in this list, heading Fertilizers. 



PHYSICAL PROPERTIES. Objects and methods of investigating certain 

 physical properties of soils. (In Agriculture Yearbook, 1900, pages 397 

 to 410, illus.) Cloth, 75c. A 1.10: 900 



PORTSMOUTH SANDY LOAM. See, in this list, heading Fertilizers. 



POTASH. 



Cooperative laboratory at Reno, Nev., for examination of potash-bearing 

 materials. 1912. 4 pages. Paper, 5c. . A 1.2 : P 84 



Extraction of potash from silicate rocks. 1912. 10 pages. Paper, 5c. 



A 26.4 : 71 



Investigation of Otero Basin, N. Mex., for potash salts. 1912. 7 pages. 

 Paper, 5c. A 26.4: 61 



Possible sources of potash in United States. Pages 523 to 536. [From Ag- 

 riculture Yearbook, 1912.] Paper, 5c. A1.10 a :611 



Potash salts and other salines in Great Basin region. 1914. 96 pages, illus. 

 Paper, 15c. A 1.3 : 61 



This bulletin embodies the results of investigations carried on in cooperation 

 with the United States Geological Survey and the Mackay School of Mines, Reno, 

 Nev., with a view to determining the existence or nonexistence of sources of potash 

 salts in the basin region. 



Topographic features of desert basins of United States with reference to 

 possible occurrence of potash. 1914. 65 pages, illus. map. Paper, 25c. 



A 1.3 : 54 



This paper describes a topographical examination which has been made of the 

 desert basins of the United States, with a view to the possible discovery of potash 

 in commercial quantities, and is intended particularly for those interested in the 

 production of fertilizers. 



See also, in this list, heading Alunite. 



POTASSIUM. Occurrence of potassium salts in salines of United States. 1913. 



96 pages, illus. Paper, 15c. A 26.3 : 94 



See also, in this list, heading Phosphates. 

 POTATOES. See, in this list, heading Fertilizers. 



PRESTON COUNTY, W. VA., Soil survey. 43 pages, illus. map. [From Field 

 Operations, 3912.] Paper, 15c. A 26.5 a : P 926 



PROBLEMS. 



Some interesting soil problems. (In Agriculture Yearbook, 1897, pages 429 

 to 440.) Cloth, 60c. A 1.10: 897 



Some soil problems for practical farmers. (In Agriculture Yearbook, 1903, 

 pages 441 to 452.) Cloth, 75c. A 1.10 : 903 



PUTNAM COUNTY, TENN. Soil survey. 32 pages, 1 illus. map. [From 

 Field Operations, 1912.] Paper, 15c. A 26.5 : P 9S3 2 



RAINFALL. See, in this list, heading Water. 



RANDOLPH COUNTY, ALA., Soil survey. 40 pages, 1 illus. map. [From 

 Field Operations, 1911.] Paper, 15c. A 26.5 a : R 159 



RIO GRANDE VALLEY. Soil survey of Middle Rio Grande Valley area, N. 

 Mex. 52 pages, 1 illus. map. [From Field Operations, 1912.] Paper, 

 15c. A 26.5 a : R 476 



ROBERTSON COUNTY, TENN., Soil survey. 26 pages, 1 illus. map. [From 

 Field Operations, 1912.] Paper, 15c. A 26.5 a : R 549 3 



ROTHAMSTED, ENGLAND. Results of investigations on Rothamsted soils, 

 lectures delivered under provisions of Lawes Agricultural Trust, by 

 Bernard Dyer, before Association of American Agricultural Colleges and 

 Experiment Stations, New Haven and Middletown, Conn., 1900. 180 

 pages. Paper, lOc. A 10.3 : 106 



NOTE. In ordering publications from this List use the words of the title as far as the 

 first period, and all the composite number which follows the price. 



