History 1,195 Indians of North America 615 Geology 558 Description and travel 540 Law and legislation 428 Forest management 415 Environmental aspects 403 Mines and mineral resources 388 Maps 355 Public lands 349 Forest reserves 337 Legislative amendments 317 Flood insurance 280 Land titles 268 Land use 268 Rivers, creeks, streams, etc 268 Outdoor recreation 235 Forests and forestry 225 Roads 218 Overland journeys to the Pacific 217 Water quality 212 Planning 209 Land use, Rural 202 Management 200 Politics and government 192 Water-supply 192 Indian reservations 190 Frontier and pioneer life 186 Missions 169 Statistics 166 Registration and transfer 157 Education 156 Hydrographic surveying 156 Navigation improvements 153 Wilderness areas 153 Water resources development 149 Claims 148 Women 140 Economic aspects 136 Water 136 Research 135 Railroads 134 Cost 133 Irrigation 131 Housing 127 Recreational use 126 Stream measurements 125 Wild and scenic rivers 125 Agriculture 121 Timber 121 Watersheds 119 Diseases and pests 118 Legal status, laws, etc 114 Finance 113 Groundwater 111 National parks and reserves 110 Paleontology 110 Fur trade 109 Logging 107 Antiquities 106 Population 106 Natural resources 105 Travel 104 Land claims 101 Watershed management 101 Streamflow 99 Douglas fir 97 Land tenure 97 Recreation areas 97 Dams 96 Economic conditions 96 Trails 95 Land transfers 94 Law 91 Soils 90 Indian land transfers 89 Public land sales 89 Surveying 87 Growth 86 Railroad land grants 81 Control 80 Fiction 77 Wildlife conservation 77 Social conditions 76 Fishes 75 Geology, Stratigraphic 75 Pioneers 74 Trees 74 Conservation of natural resources 73 Man-woman relationships 72 Reclamation of land 72 Boundaries 71 Wetlands 71 Indians 70 City planning 69 Discovery and exploration 69 Murder 69 Environmental conditions 68 Social life and customs 68 Families 67