178 INDEX TO PUBLICATIONS OF U. S. GEOL. SURVEY. [bull. 215. 
Potomac formation; Aquia Creek series of deposits and flora. Ann 15, 
pp 326-330, 367-368; Ann 16, i, pp 482-483, 530-532, 538, 542 
areal extent of Ann 14, i, pp 227-228 
iron-ore series of deposits and flora Ann 15, pp 330-332; Ann 16, i, p 473 
Island series of deposits and flora Ann 16, i, pp 473-474, 523, 524, 531, 532 
James River series of deposits and flora Ann 15, pp 
318-320, 346-347; Ann 16, i, pp 473, 482-483, 523, 524, 530-532 
Mount Vernon series of deposits and flora ' Ann 15, 
pp 324-325, 348-360; Ann 16, i, pp 473, 523, 530-532, 538, 539 
of New York City district GF 83, p 10 
< »f Virginia, Norfolk quadrangle GF 80, p 2 j 
Rappahannock series of deposits and flora Ann 15, pp 
321-324, 347-348; Ann 16, i, pp 473, 482-483, 523, 524, 530-532 
Potomac River and tributaries, flow of, measurement of Ann 22, 
iv, 131-144; WS 48, pp 115-117, 121-124; WS 65, j 
pp 229-230, 232-234; WS 75, pp 33-35, 39-40 
Potosi series of Colorado, Silverton quadrangle Bull 182, pp 32-33 
Potsdam formation or group in Illinois GF 81, p 2 
in Iowa Ann 11, i, p 332 
in Lake Superior region Ann 3, p 156; Ann 7, p 418 
junction between Keweenaw series and Bull 23 
in Mississippi Valley Bull 8, pp 39-40; Bull 43, p 49 
in New York Bull 30, pp 20-24, 67 
in St. Lawrence Valley and on northern side of Adirondacks Ann 12, 
i, pp 549-550 
in Wisconsin Ann 11, i, p 332; Bull 8, pp 12, 15, 18, 21 
water supply from WS 67, pp 59-60 
Potsdam and Huronian formations, unconformity between Ann 7, pp 409— 412i 
Potsdam sandstone and Keweenaw series, unconformity between. .Ann 7, pp 412-414 
Pottery, statistics of MR 1900, pp 695, 696, 714-727; MR 1901, pp 699-710 
Pottsville conglomerate, clays of PP 11, p m 
of Pennsylvania : Ann 22, in, pp 66, 67j 
of Pennsylvania, Ohio, and West Virginia, bituminous coal field Bull 65, 
pp 1 79-205 
of West Virginia PP 11, p 252 
Pottsville formation of Erie and Ohio basins Mon xli, p 64j 
of Maryland, coal field Ann 22, in, pp 202, 204 
of Ohio, bituminous field Ann 22, in, pi xn, p 21t 
of Pennsylvania GF 82, p 1\ 
bituminous field Ann 22, in, pp 130-131 
northern Ann 22, in, pp 613-615 
section of PP 11, p 13< 
Poughquag quartzite of New York City district GF 83, p 4 
Powell moraine, Ohio, distribution, topography, etc., of Mon xli, pp 524-531 
Power, electric, available, on Hawaiian Islands, Molokai WS 77, p 6( 
development of, in California, Kern River, possibilities of WS 46, pp ll-3£ 
in California, King River Basin WS 58, pp 48-95 
Power, water. (See Water power. ) 
Pratt ( J. H. ), abrasive materials, statistics of MR 1900 
pp 787-801; MR 1901, pp 781-805 
aluminum and bauxite, statistics of MR 1900, pp 229-23 
antimony, statistics of MR 1900, pp 251-25 
asbestos, statistics, occurrence, etc. , of MR 1900ii 
pp 861-868; MR 1901, pp 887 
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