BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 63 
Demming, Henry C. — Continued. 
708. Report of the mineralogist.— Pennsylvania Dept. Agric, 12th Ann. Kept., 
pp. 466^170, 1907. 
Gives notes upon the mineral resources of Pennsylvania. 
709. Report of consulting geologist. — Pennsylvania Dept. Agric., 12th Ann. 
Kept, pp. 473-176, 1907. 
Includes notes upon the economic resources of Pennsylvania. 
Denis, Theo. 
710. Western oil, gas, and coal fields.— Canada, Geol. Survey. Summ. Kept, 
for 1906, pp. 164-169, 1906. 
Gives notes on the occurrence of oil, natural gas, and coal in Ontario. Alberta, and 
British Columbia. 
Dennis, Clifford G. 
711. Rare mercury ores.— Min. and Sri. Press, vol. 9.1, p. «>2, 2 fi^s., July 20, 
1907. 
Describes the occurrence of quicksilver ores ai Terlingua, Kn-wster County, Texas. 
Derby, Alice Greenwood. 
712. A subject index of the publications of the Geological Survey of Ohio, 
from its inception to and including Bulletin number eight, series four. — Ohio 
Geol. Survey, 4th ser., Bull. no. 6, pp. 15-233, 1906. 
Derleth, Charles, Jr. 
713. Some effects of the San Francisco earthquake on water-works, streets, 
sewers, car tracks, and buildings. — Eng. News, vol. 55, no. 20, pp. 548-554, 20 
figs., May 17, 1906. 
714. The destructive extent of the San Francisco earthquake of 1906.— Eng. 
News, vol. 55. no. 26, pp. 707-713, 17 figs., June 28, 1 «.»<»*;. 
Discusses movement along the fault line, producing the earthquake. 
Dern, John. 
715. The mining and mineral resources of Utah. — Am. Min. Congr., Kept. 
of Proc, 9th Ann. Sess., pp. 166-177, 1907; Mines and Minerals, vol. 27. no. 6, 
pp. 250-252, January, 1907. 
Deussen, Alexander. 
716. Cement resources and industry of Texas. — The Tradesman, Chatta- 
nooga, Tenn., vol. 56, no. 6, pp. 46—19, November 15, 1906. 
DeWolf, Frank W. 
717. Coal investigations in the Saline-Gallatin field, Illinois, and the ad- 
joining area.— U. S. Geol. Survey, Bull. no. 316, pp. 116-136, 2 pis., 1 fig., 1907. 
Preliminary investigations of Illinois fire clays. — See Purdy and DeWolf. 
no. 197:;. 
DeWolfe, Loran A. 
718. The structure and succession at North Sydney and Sydney .Mines, 
C. B.— Nova Scotian Inst. Sci., Trans., vol. 11, pt. 2, pp. 289-323, L906. 
Describes the occurrence, character, and relations of the Carboniferous strata of the 
region, including many detailed sections, and gives a summary of the geologic history. 
Diaz, Severo. 
719. Efemerides del volcan de Colima segun las observaciones practicadea 
en los observatorios de Zapotlan y Colima de 1893 a L905. Congr. geol. intern., 
C. R., 10° sess., Mexico. 1906, pp. 76:; 960, 6 pis.. 1907. 
A daily record of observations made on the volcano Colima. 
