BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 29 
Bog-gild, O. B. 
251. On some minerals from Narsarsuk at Jnlianehaab, Greenland. — Med- 
delelser om Gronland, Hefte 33, pp. 97-120, 10 figs., 1907; Mineral, and Geol. 
Mus., Copenhagen, Contr. to Mineral., no. 7, 1906. 
Describes physical, crystallographies and optical characters. 
Bbhm, C. Richard. 
252. Monazite sand. — Eng. and Min. Jonr., vol. 81, p. 842, May 5, 1906. 
Describes the occurrence in North Carolina and South Carolina. 
[Boileau, John W.] 
253. Coal fields of southwestern Pennsylvania, Washington and Greene 
counties. Fields of coking coal located in eastern Greene and southeastern 
Washington counties, Pa., owned and largely controlled by Mr. J. Y. Thompson. 
Copyright, September, 1907, by John W. Boileau. 90 pp., map and illustrations. 
Includes a description of the geologic structure of the area, 
Bonsteel, Jay A. 
254. The soils of St. Mary's County [Maryland]. — Maryland Geol. Survey, 
St. Mary's County, pp. 125-146, 1907. 
Bonsteel, Jay A., and Burke, R. T. Avon. 
255. The soils of Calvert County [Maryland]. — Maryland Geol. Survey, Cal- 
vert County, pp. 135-167, 1907. 
Bordeaux, Albert. 
256. Les mines d'or de la Californie. — Revue univ. des Mines, 3 e ser., t. 53, 
pp. 30-82, 245-307, 1901. 
Includes an account of the occurrence of the ores. 
Bose, Emilio. 
257. Sobre algunas faunas terciarias de Mexico. — Mexico, Inst. Geol., Bob, 
no. 22, 97 pp., 12 pis., 1906. 
Describes Mollusca from Tertiary beds of Mexico. 
258. La fauna de Moluscos del Senoniano de Cardenas, San Luis Potosi 
[Mexico].— Mexico, Inst. Geol., Bob, no. 24, 95 pp., 18 pis., 1906. 
Discusses stratigraphic position and correlation of the beds from which the fauna 
described was derived, and gives systematic descriptions of the Mollusca. 
259. Excursions a Chavarrillo, Santa Maria Tatetla, Vera Cruz, et Orizaba 
[Mexico]. — X p Congr. geol. intern., Guide des Excursions, Mexico, no. II, 11 pp., 
1 pi., 1906. 
Describes the geology of the country along the route traveled. 
260. Excursions aux mines de soufre de la Sierra de Banderas [Mexico]. — 
X e Congr. geol. intern., Guide des Excursions, Mexico, no. XIX, 8 pp. 2 figs., 
1906. 
Describes the occurrence of sulphur deposits. 
261. Excursion an Cerro de Muleros pres ciudad Juarez (Chihuahua). — 
X c Congr. geol. intern., Guide des Excursion, Mexico, no. XX, 24 pp., 6 pis. 
(inch geol. map and sections), 1906. 
262. Excursion dans les environs de Pan-as [Mexico]. — X p Congr. geol. 
intern., Guide des Excursions, Mexico, no. XXIII, 16 pp., 6 pis. (hid. geol. map 
and sections). 
263. Excursions dans les environs de Monterrey el Saltillo [Mexico]. X 
Congr. geol. intern.. Guide des Excursions, Mexico, no. XXIX, 17 pp., ."» pis.. 1906. 
Describes the geology of the region. 
