Geology 59
Puerto Rico Politics and government 50
Puerto Rico 48
Groundwater 47
Reservoir sedimentation 42
Water-supply 32
Self-determination, National 30
Puerto Rico Relations 29
United States Relations 29
Aquifers 28
Statehood (American politics) 22
Geology, Stratigraphic 20
Floods 18
Puerto Rico Economic conditions 18
Sedimentation and deposition 18
Water quality 18
Hurricanes 17
Hydrogeology 16
Disaster relief 15
Hurricane Maria, 2017 15
Sediments (Geology) 15
Hurricane damage 14
Puerto Rico History 14
El Yunque National Forest (P.R.) 13
Debts, Public 12
Puerto Rico Appropriations and expenditures 12
Stream measurements 12
Groundwater flow 10
Hydrology 10
Referendum 10
Rules and practice 10
Budget deficits Law and legislation 9
Debts, Public Law and legislation 9
Emergency management 9
Groundwater Quality 9
Hurricane Irma, 2017 9
Plebiscite 9
Water table 9
Financial crises 8
Forest management 8
Karst 8
Marine sediments 8
Puerto Ricans 8
Reservoirs 8
Wildlife refuges 8
Forests and forestry 7
Groundwater flow Mathematical models 7
Landslides 7
Mines and mineral resources 7
Puerto Rico Social life and customs 7
Water resources development 7
Debt relief 6
Forest policy 6
Land titles Registration and transfer 6
Sand 6
Streamflow 6
United States 6
Water use 6
Appropriations and expenditures 5
Auditing 5
Electric power systems Natural disaster effects 5
Evaluation 5
Groundwater Pollution 5
History 5
Irrigation 5
Lake sediments 5
Timber 5
Watershed management 5
Bankruptcy 4
Carraízo Reservoir (P.R.) 4
Coasts 4
Conflict of interests 4
Coral reefs and islands 4
Disclosure of information Law and legislation 4
Finance, Public 4
Flood control 4
Forest management Law and legislation 4
Forest reserves Recreational use 4
Forest surveys 4
Forests and forestry Citizen participation 4
Formations (Geology) 4
Geochemistry 4
Land use 4
Older people Services for 4
Pilot guides 4
Puerto Rico Foreign relations 4
Rain and rainfall 4
Renewable energy sources 4
Saltwater encroachment 4
San Juan National Historic Site (San Juan, P.R.) 4
Stream-gaging stations 4
United States Foreign relations 4
Water consumption 4
Watersheds 4
Benthos Habitat 3
Borings 3
Budget deficits 3
Channels (Hydraulic engineering) 3
Clemency Political aspects 3
Climatic changes 3