366 



CEMENTS, LIMES, AND PLASTERS. 



References on slates. The following papers contain material of 

 interest in connection with the composition, distribution, and structure 

 of slate. 



Dale, T. N. The slate belt of eastern New York and western Vermont. 19th 



Ann. Rep. U. S. Geol. Survey, pt. 3, pp. 153-307. 1899. 

 Dale, T. N. The slate industry at Slatington, Pa., and Martinsburg, W. Va. 



Bulletin 213, U. S. Geol. Survey, pp. 361-364. 

 Dale, T. N. The slate deposits and slate industry of the United States. 



Bulletin , U. S. Geol. Survey. (In press.) 



Davies, D. C. Slate and slate quarrying. 12mo, 181 pp. London, 1899. 

 Eckel, E. C. Slate deposits of California and Utah. Bulletin 225, U. S. Geol. 



Survey, pp. 417-422. 1904. 

 Eckel, E. C. The chemical composition of American shales and roofing slates. 



Journal of Geology, vol. 12, pp. 25-29. 1904. 



