PUBLICATIONS ON PHOSPHATES AND OTHER FERTILIZERS. 
The following papers relative to natural materials used as fertilizers 
have been published by the United States Geological Survey, or by 
members of its staff: 
Darton, N. H. Notes on the geology of the Florida phosphates. In Am. Jour. 
Sci., 3d series, Vol. XLI, pp. 102-105. 1891. 
Eckel, E. C. Recently discovered extension of Tennessee white phosphate 
field. In Mineral Resources U. S. for 1900, pp. 812-813. 1901. 
Eldridge, G. H. A preliminary sketch of the phosphates of Florida. In Trans. 
Am. Inst. Min. Eng., Vol. XXI, pp. 196-231. 1893. 
Hayes, C. W. The Tennessee phosphates. In Sixteenth Ann. Rept. U. S. 
Geol. Survey, Pt. IV, pp. 010-630. L895. 
— The Tennessee phosphates. In Seventeenth Ann. Rept. IT. S. Geol. 
Survey, Pt. II, pp. 1-38. 1896. 
The white phosphates of Tennessee. Trans. Am. Inst. Min. Eng.. Vol. 
XXV, pp. 19-28. 1896. 
A brief reconnaissance of the Tennessee phosphate field. In Twentieth 
Ann. Rept. U. S. Geol. Survey, Pt. VI, pp. 63:: 638. 1899. 
The geological relations of the Tennessee brown phosphates. In Science, 
Vol. XII, p. 1005. 1900. 
Tennessee white phosphate. In Twenty-first Ann. Rept. U. S. Geol. 
Survey, Pt. Ill, pp. 473-48.-). 1901. 
Ihlseng, M. C. A phosphate prospect in Pennsylvania. In Seventeenth Ann. 
Rept. U. S. Geol. Survey, Pt. Ill, pp. 955-957. 1896. 
Memminger, C. G. Commercial development of the Tennessee phosphates. In 
Sixteenth Ann. Rept. U. S. Geol. Survey, Pt. IV. pp. 631-635. L895. 
Moses, O. A. The phosphate deposits of South Carolina. In Mineral Resources 
U. S. for 1882, pp. 504-521. 1883. 
Orton, E. Gypsum or land plaster in Ohio. In Mineral Resources U. S. 
for 1887, pp. 596-601. 1888. 
Penrose, R. A. F. Nature and origin of deposits of phosphate of lime. Bul- 
letin U. S. Geol. Survey No. 46. 143 pp. 1888. 
Stubbs, W. C. Phosphates of Alabama. In Mineral Resources U. S. for 1883- 
84, pp. 794-803. 1885. 
Wilber, F. A. Greensand marls in the United States. In Mineral Resources 
U. S. for 1882, pp. 522-526. 1883. 
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