Subject
Tax auditing
44
Longwall mining
39
Coal mines and mining
29
Leaching
27
Mine roof control
25
Ground control (Mining)
23
Coal mines and mining Dust control
20
Coal mines and mining Safety measures
20
Mines and mineral resources
18
Mine ventilation
17
Geology
16
Water resources development
16
Intelligent transportation systems
15
Mine dusts
15
Mine fires
15
Rock mechanics
15
Mine subsidences
14
Traffic accidents
14
Appropriations and expenditures
13
Boring
12
Natural gas pipelines Environmental aspects
12
Nutrition surveys
11
Traffic safety
11
Patent laws and legislation
10
Radioactive waste disposal
10
Water-supply
10
Air Pollution
9
Copper Metallurgy
9
Fire prevention Research
9
History
9
Internet Law and legislation
9
Management
9
Mine roof bolting
9
Mine safety
9
Reclamation of land
9
Tax administration and procedure
9
Technology transfer
9
Trademarks Law and legislation
9
Water quality
9
Automobiles Crash tests
8
Groundwater Pollution
8
Industrial hygiene
8
Industrial safety
8
Mine fires Prevention and control
8
Coal Geology
7
Coal mine accidents
7
Coal mines and mining Environmental aspects
7
Coalbed methane drainage
7
Flotation
7
Geomagnetism
7
more ...