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Landowners
830
Real Property
830
Groundwater
135
Rivers
103
Sequence stratigraphy
102
Water quality
102
Geology
36
Soil
36
Geology, Structural
21
Joints (Geology)
20
Water-supply
11
Gravel
9
Sand
9
Geology, Stratigraphic
7
Railroads
7
Roads
5
Sediments (Geology)
5
Glacial landforms
4
Mineral industries
4
Coal
3