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46 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, [bull. 27; 
Eckel (Edwin C). 
1. Gypsum deposits in New York. 
U. S. Geol. Surv., Bull. no. 223, pp. 33-35, 1 pi., 2 figs., 1904. 
Describes economic development and geologic relations of the gypsum deposit 
in the Salina group. 
2. Gypsum deposits in Virginia. 
U. S. Geol. Surv., Bull. no. 223, pp. 36-37, 1 pi., 1 fig., 1904. 
Describes economic development and geologic relations of gypsum beds occur 
ring in Carboniferous strata. 
3. The slate deposits of California and Utah. 
U. S. Geol. Surv., Bull. no. 225, pp. 417-422, 1904. 
Describes the occurrence and character of slate deposits in Eldorado County. | 
California, and near Provo, Utah. 
4. Cement-roek deposits of the Lehigh district of Pennsylvania and 
New Jersey. 
U. S. Geol. Surv., Bull. no. 225, pp. 448-455, 1904. 
Describes location and general geology of the district, the stratigraphic position 
and character of the cement rock, methods of manufacturing and character 
of the product. 
5. The salt industry in Utah and California. 
V. S. Geol. Surv., Bull. no. 225, pp. 488-495, 1904. 
Describes character and source of materials used and methods of manufacture' 
employed. 
6. On a California rooting slate of igneous origin. 
Jour. Geol., vol. 12, pp. 15-24, 1904. 
Describes occurrence and character of slate deposits in California and discusses 
their origin. 
7. On the chemical composition of American shales and rooting slates. 
Jour. Geol., vol. 12, pp. 25-29, 1904. 
8. The nonmetallic mineral products of the United States. 
Mg. Mag., vol. 10, pp. 107-174, 1 pi., 1904. 
Contains notes on the occurrence of nonmetallic mineral products. 
9. Brown hematite deposits of eastern New York and western New 
England. 
Eng. & Mg. Jour., vol. 7s, pp. 432-434, 6 tigs., 1904. 
Describes the general geology of the region, and the character and occurrence 
of the iron ores, and discusses their origin. 
1(>. The materials and manufacture of Portland cement. 
Ala. Geol. Surv., Bull. no. 8, pp. 1-59, 1904. 
Includes a discussion of the origin and general characters of limestone and i 
other raw materials used in cement manufacture. 
Eckel (E. C), Johnson (L. C.) and. 
1. Notes on wells, springs, and general water resources of Mississippi. 
See Johnson (L. C.) and Eckel (E. C), 1. 
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