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Atmospheric sulfur oxides - Counting - Texas - Alibates Flint Quarries National Monument |
Atmospheric sulfur oxides - Counting - Colorado - Bent's Old Fort National Historic Site |
Atmospheric sulfur oxides - Counting - New Mexico - Capulin Volcano National Monument |
Atmospheric sulfur oxides - Counting - Oklahoma - Chickasaw National Recreation Area |
Atmospheric sulfur oxides - Counting - New Mexico - Fort Union National Monument |
Atmospheric sulfur oxides - Counting - Texas - Lake Meredith National Recreation Area |
Atmospheric sulfur oxides - Counting - Texas - Lyndon B. Johnson National Historical Park |
Atmospheric sulfur oxides - Counting - New Mexico - Pecos National Historical Park |
Atmospheric sulfur oxides - Counting - Oklahoma - Washita Battlefield National Historic Site |
Environmental monitoring - Texas - Alibates Flint Quarries National Monument |
Environmental monitoring - Colorado - Bent's Old Fort National Historic Site |
Environmental monitoring - New Mexico - Capulin Volcano National Monument |
Environmental monitoring - Oklahoma - Chickasaw National Recreation Area |
Environmental monitoring - New Mexico - Fort Union National Monument |
Environmental monitoring - Texas - Lake Meredith National Recreation Area |
Environmental monitoring - Texas - Lyndon B. Johnson National Historical Park |
Environmental monitoring - New Mexico - Pecos National Historical |