BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, l ( J0(i— 1907. 141 
Nicholas, Francis C. — Continued. 
1800. The Gold Hill copper mine, and its development— Min. World, vol. 27, 
pp. 1001-1002, 4 figs., December 7, 1907. 
1801. Recent developments at Furnace Creek copper mines. — Min. World, 
vol. 27, pp. 1087-1 OSS, :{ figs., December 21, 1907. 
Nichols, Henry Windsor. 
1802. New tonus of concretions. — Field Columbian Mus., Geol. Ser., vol. 3, 
no. 3, pp. 25-54, 9 pis., 1906. 
Describes the occurrence, appearance, and constitution of concretions from various 
localities, and discusses the mode of their formation. After describing nodules from 
the Challenger and Argus banks in the Atlantic Ocean, discusses the formation of mag- 
nesian limestone. 
1803. Absence of lead and copper from certain deep sea deposits. — Econ. 
Geology, vol. 2, no. 3, pp. 309-311, 1907. 
Nickles, Jobn M. 
Classified list of papers dealing with coal, coke, lignite, and peat contained 
in the publications of the U. S. Geological Survey. — Sec Lee and Nickles, no. 
1549. 
Nicol, John M. 
1804. Black sand.— Min. and Sci. Press, vol. 04, pp. 82-84, January 19, 1907. 
Nicolas, F. J. 
Catalogue of publications of the Geological Survey of Canada. — See Canada, 
Geological Survey, no. 417. 
Norton, William Harmon. 
1805. Geology of Bremer County [Iowa]. — Iowa Geol. Survey, vol. 16, pp. 
319-40."), 10 figs., 2 geol. maps, 1906. 
Describes the topography and drainage, the stratigraphy — Ordovician, Silurian, Devo- 
nian, and Pleistocene — and the economic products. 
Norwood, Charles J. 
1806. Clays in several parts of Kentucky, with sonic account of sands, 
marls, and limestones. — Kentucky Geol. Survey, Bull. no. ('». 223 pp.. 1905. 
Contributes various notes to the articles on clays comprising tliis bulletin. 
1807. Reporl on the progress of the survey for the years 1904 and 1905. - 
Kentucky Geol. Survey, 50 pp., 1905. 
An administrative report, but includes various data pertaining to the geology of 
Kentucky. 
Obalski, J. 
1808. A new mining district in Quebec. — Fug. and Min. Jour., vol. 71). p. 513, 
March 1(5, 1905. 
Includes notes on the occurrence of various ores. 
1809. Chibogomo mining district.— Quebec, Dept. Colonization. .Mines, and 
Fisheries. Mining Operations in the Province of Quebec for the year 1905, pp. 
23-30. 1906. 
Gives an account of the mining district. Includes part of a reporl by Low I see no. 
1G24| on the geology and mineral resources of the district. 
1810. Rare earths in pegmatite veins.— Canadian Min. Inst.. Jour., vol. ••». 
pp. 72-73, 1900. 
1811. Mining operations in the Province of Quebec for the year L906. 
Quebec, Dept. of Colonization, Mines and Fisheries, 59 pp., 7 pis., and map. 1907. 
