8?/ INDEX TO PUBLICATIONS OF U. S. GEOL. SURVEY. [bull,215. 
Colorado; Twin Lakes, discharge measurements of WS 50, p 321 
Twin Lakes, reservoir at WS 74, pp 73-75 
Uneompahgre River, flow of, measurement of Ann 22, 
iv, p 392; WS 50, pp 379-380; WS 74, pp 135-139 
seepage on, measurement of WS 50, p 306 
uranium in, production of MR 1900, p 265 
water, low, measurement of, in northwestern. Ann 22, iv, pp 395-397 
water resources of WS 74 
White River, flow of, measurement of WS 66, pp 91-92 
Yampa River, flow of, measurement of WS 66, pp 89-91 
Colorado Canyon, Nevada, geology of Bull 208, p 133 
Colorado division of Texas GF 76, p 5 
Colorado formation, character, extent, and invertebrate fossils of Ann 15, p 99 
Colorado River, flow of, measurement of Ann 22, 
iv, pp 357-398; WS 50, p 387; WS 66, p 104 
Colorado Basin, stream measurements in WS 66, pp 82-104 
Colorado River, Texas, flow of, measurement of WS 50, 
pp 336-338; WS 66, p 64; WS 75, p 152 
Columbia formation, age and areal extent of Ann 14, i, p 228 
of Georgia, clays of -PP 11, p 92 
i »f Gul f (•« >ast Bull 212, pp 26-27 
of Virginia GF 80, p 3 
Columbia River, hydrographic work in basin of Ann 22, iv, pp 421-457 
stream measurements in basin of WS 66, pp 126-138 
Columbia River lava in Idaho, Nez Perce region WS 53, pp 28-42 
in Oregon, John Day Basin Bull 204, p 19 
in Washington Ann 15, p 100 
Colvins Run limestone of Pennsylvania Bull 65, p 39 
Comal River, Texas, (low of, measurement of WS 50, pp 339-340 
Comanche series < »f Texas, Austin quadrangle GF 76, pp 3-5 
Conasauga formation of Georgia GF 78, pp 2-3 
of Tennessee GF 75, p 2 
Conasauga River and tributaries, flow of, measurements of WS 49, p 209 
Concho River, Texas, flow of, measurement of WS i^i, pp 61-62 
Concord River, Massachusetts, quality of water of WS 79, pp 39-40, 45 
Concretionary structures and granules, thin sections of, in Clinton iron 
ore .Mon xliii, p 250 
( lonejos River, Colorado, flow of, measurement of WS 50, 
p 348; WS 74, pp 106-107, 109 
seepage < >n, measurement of WS 50, p 306 
Conemaugh formation of P>ie and ( )hio basins Mon xli, p 65 
of Maryland, coal held Ann 22, in, pp 202, 203 
section of PP 11, p 138 
of Ohio, bituminous field Ann 22, in, pi xii, p 216 
of Pennsylvania, bituminous field Ann 22, in, pp 171-172; GF 82, p 8 
Conemaugh group, clays of PP 11, p 54 
Conglomerate group of Ohio, clay of PP 1 1, p 193 
of Pennsylvania, clays of PP 11, pp 212-215 
Conglomerates of Minnesota, Mesabi district Mon xliii, pp 75-78, 94-98, 154-159 
Conneaut Creek, Pennsylvania, course, present and preglacial. of. .Mon xli, pp 214-215 
Connecticut; borings, deep, in, list of WS 57, p 20 
building stone from, statistics of. ..MR 1900, p 662 et seq; MR 1901, p 643 et seq 
clay deposits and industry of PP 1 1, pp 48, 78-79 
clay products of, statistics of MR 1900, 
p 695 et seq; MR 1901, p 674 et seq; PP 11, p 79 
