Subject
Geology
263
Kentucky
64
Groundwater
49
Geology, Stratigraphic
45
Water quality
37
Coal
33
Water-supply
26
Paleontology
25
Mines and mineral resources
19
Groundwater flow
18
Hydrogeology
18
Hydrology
18
Fluorspar
17
Stream measurements
16
Kentucky History
15
National parks and reserves
14
Abraham Lincoln Birthplace National Historical Park (Ky.)
13
Geology, Structural
12
Water Pollution
12
Aquifers
11
Historic sites
11
Streamflow
11
Coal mines and mining
10
Military education
10
Daniel Boone National Forest (Ky.)
9
Groundwater Pollution
9
Coal Geology
8
Water Composition
8
Frontier and pioneer life
7
Groundwater Quality
7
Hydroelectric power plants Licenses
7
Outdoor recreation
7
Pesticides Environmental aspects
7
Petrology
7
Strip mining Environmental aspects
7
Water quality Measurement
7
Water quality management
7
Buildings
6
Coal Sampling
6
Coal mines and mining Environmental aspects
6
Freshwater biology
6
Geochemical prospecting
6
Hydroelectric power plants Law and legislation
6
Limestone
6
Paleobotany
6
Trails
6
Wages
6
Birthplace
5
Borings
5
Coal preparation
5
more ...