42 INDEX TO PUBLICATIONS OF U. S. GEOL. SURVEY. [bull.215. 
Algonkian system, definition of Ann 14, i, p 43 
Alkaline conditions of water and soil in Kings River delta, California WS 58 
pp 82-85 
Alkalinity of river water, determination of WS 7(5, pp 76-86 
Allegheny formation of Erie and Ohio basins Mon xli, p 64 
of Maryland, coal field Ann 22, in, pp 202, 204 
section of PP 11, p 137 
of Ohio, bituminous field Ann 22, in, pi xii, p 216 
of Pennsylvania OF 82, pp 7-8 
bituminous field Ann 22, in, pp 136-138 
Allegheny Plateaus, structure, drainage, relief, etc., of GF 72, 
p 1; GF 77, p 1; GF 82, pp 1-2 
Allegheny River, fall of, rate of Mon xu, pp 125-127 
quality of water of WS 79, pp 1 19-124 
rock floor, altitude of, and valley of, description of Mon xli, pp 127-129 
Allegheny River Coal Measures of Pennsylvania Ann 22, in, p 66 
Allegheny River series of Pennsylvania, Ohio, and West Virginia, bituminous 
coal field of Bull 65, pp 99-178 
Allegheny River system, preglacial and present features of Mon xli, pp 129-138 
Allegheny Valley, Pennsylvania, coal field of, recent work in Bull 213, pp 272-274 
Allen River, Alaska, course and character of PP 10, p 24 
reconnaissance from Fort Hamlin to Kotzebue Sound by way of Dall, 
Kanuti, and Kowak rivers and PP 10 
Allophane, analyses of, from Missouri, Aurora, Bowyer mine Ann 22, n, p 118 
Alluvial deposits in Iowa, northeastern Ann 11, i, pp 234, 417-425 
in Nebraska, Camp ( Jlarke quadrangle GF 87, p 3 
Scotts Bluff quadrangle GF 88, p 3 
in Oregon, Coos Bay quadrangle GF 73, p 4 
Port Orford quadrangle GF 89, p 3 
in West Virginia, Charleston quadrangle GF 72, p5 
Almandite, occurrence of MR 1901, p 746 
Alpreston quartzite of Montana Ann 22, n, p 435 
Altamont limestone of Kansas Ann 22, in, p 342 
Alton fire clay of Pennsylvania PP 11, p 213 
Alum, preparation of, from slags Bull 213, p 229 
Aluminum, ores of MR 1901, p 968 
Aluminum and bauxite, statistics of.... MR 1900, pp 229-231; MR 1901, pp 225-229 
Alunite, analysis of, from Colorado, Silverton quadrangle Bull 182, p 235 
Amargosa Valley, California, geology of Bull 208, pp 194-195 
Amber, occurrence of MR 1901, p 762 
American Fork, Utah, flow of, measurement of WS 51 , 
pp 417-418; WS 66, p 124; WS 75, p 195 
irrigation data relating to WS 52, pp 504-505 
American isthmus, hydrography of Ann 22, iv, pp 507-630 
American River, California, flow of, measurement of WS 51, p -ISO 
forest conditions in basin of PP 8, pp 145-1 73 
American rock cement, statistics of MR 1 900, pp 745-748 
Americus limestone of Kansas, synonymy, character, and fauna of. .Bull 211, pp 53-54 
Ames limestone of Ohio Bull 65, pp 90-91 
Amethyst, occurrence and statistics of MR 1901, pp 751-754,770 
Ammonia in water, determination of WS 79, pp 24-25 
Ammonium chloride, action of, upon silicates Bull 207 
Ammonoids, Carboniferous, of America Mon x li i 
