196 



INDEX. 



Page. 



OH and gas lands, laws concerning- 26, 39 



leasing of 47^8 



restorations of 122-123 



withdrawals of— 38-39, 44, 46, 121-122 



legal authority for 43-44 



See also Oil and gas ; Oil rock. 



Oil and gas section, organization of_ 17 

 worl5 of 17 



Oil fields in United States, positions 



of 116-117 



OH rock, character of 119 



depth of 119 



structure of 114-116 



water in 120 



Oklahoma, oil in 117 



Oregon, enlarged homestead in 22 



oil in 117 



P. 



Patents, application for, time limit 



on 49 



Phosphate lands, area of, still be- 

 longing to United States _ 8 



classification of, factors in 128-129 



principles governing 129—130 



regulations for 130-132 



diagram illustrating 131 



distribution of 124-128 



restorations of 134 



withdrawals of- 39-40, 125-128, 132-133 



Phosphates, definition of 124 



exports of 40 



lands containing, distribution 



of 124,128 



production of, in United States 124 



use of 123-124 



Phosphate section, organization of 17 



work of 17 



Phosphorus, depletion of, in farm- 

 ing land 123-124 



Placers, inyestigation of claims 



for 147-148 



laws concerning 25, 40 



Potash deposits, formation of 135-136 



occurrence of 134-135 



search for 40, 136 



Potash lands, classification of 137 



exploration for 40 



leasing of 48 



withdrawal of 40, 137 



See also Potash deposits. 

 Powell, J. W., report of, on land 



classification 11-12 



Power development, grants for, laws 



concerning 28-29 



Prospecting, aid to, from classifica- 

 tion 157-158 



permits for 48 



Public-land laws. See Agricultural 

 lands ; Mineral lands ; Coal 

 lands ; Public uses. 



Public-land surveys, methods of 61-62 



Public uses, lands for, laws con- 

 cerning 27-29, 192 



lands for, leasing of 49 



Pyrite, occurrence of 140 



K. Page. 



Railroad grants, classfflcatlon of 



lands of 148 



laws concerning 31-32 



Railroads, access by, to coal land, 



allowance for 95 



right of way grants to 27-28 



routes for, over water-power 



Bites 168, 172 



Range, water supply on, withdraw- 

 als for 42-^3, 191-192 



Reclamation, development of 14—15 



laws for 19, 22 



Reconnaissance surveys, methods of- 60-61 



Reservoir sites, withdrawals of 42 



See also Water-supply sites. 



Restorations of lands, extent of 52 



See also particular classes of 

 lands; W^ter-power sites, 

 etc. 



Richards, R. W., work of 10 



Right of way, grants for, laws con- 

 cerning 27-29, 161, 192 



leasing of - 49 



River surveys, execution of 173 



Rocky Mountains, oil in . 117 



Rogers, G. S., work of 10 



S. 



Salines, laws concerning 26 



origin of 135-136 



See also Potash deposits. 



Salt, common, occurrence of 139 



School lands, classification of 145 



grants of, laws concerning 29 



Scientific data, acquirement of, from 



classification 158-159 



Schultz, A. R., work of 10 



Sedimentary rocks, oil in 113-114 



Separations, authority for 45-^6 



definition of 37,45 



extension of 46-47,177 



Smith, G. O., report of, on land 



classification 13 



Soapstone, occurrence of 139 



Stabler, Herman, work of 10 



States, allotments from proceeds of 



leases to, proposal of 49 



State grants, laws concerning 29-31 



Stone, deposits of, laws concerning- 25-26 

 Stone and timber land law, provi- 

 sions of 23 



Stream flow, records of 181-182 



Structure, importance of, in oil-land 



classification 114r-116 



Structure contours, explanation of 57-58 



Surveyors, deputy, classification by- 34 

 Surveys for mineral classification, 



methods of 53-62 



topographic base for. existence 



of 53-54 



making of 55-58 



need for 53-58 



See also Reconnaissance surveys ; 

 Public-land surveys. 



