Subject
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Willacy County (Tex.)
18
Environmental impact statements
17
Rules and practice
17
Texas Emigration and immigration
17
Water resources development
17
Balcones Canyonlands National Wildlife Refuge (Tex.)
16
Big Bend National Park (Tex.)
16
Cattle trade
16
Guadalupe Mountains National Park (Tex.)
16
Historic sites Law and legislation
16
History
16
Hunting
16
Ranch life
16
Environmental monitoring
15
Land grants
15
Mexican Americans
15
Texas Altitudes
15
Water chemistry
15
Environmental impact analysis
14
Geology, Economic
14
Trails
14
Emergency management
13
Iron ores
13
National parks and reserves Law and legislation
13
Outdoor recreation
13
Soil compaction
13
Texas County (Okla.)
13
Texas Economic conditions
13
United States History
13
Wildlife refuges
13
Grants-in-aid Auditing
12
Groundwater flow Computer simulation
12
Historic sites
12
Limestone
12
Mexico History
12
Paleobotany
12
Radioactive waste disposal in the ground
12
Texas Social life and customs
12
Bench-marks
11
Coahuila (Mexico : State)
11
Evaluation
11
Families
11
Flower Garden Banks National Marine Sanctuary (Tex.)
11
Harris-Galveston Coastal Subsidence District (Tex.)
11
Leveling
11
Natural resources
11
Nutrient pollution of water
11
Oklahoma
11
Sedimentation and deposition
11
Water resources development Law and legislation
11
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