The Clean Air Act designates 156 national parks and wilderness areas as Class I areas for visibility protection.
There are 156 national parks and wilderness areas designated for visibility protection.
There are no national parks that need visibility protections.
A man is lying down with his eyes closed.
Steel requirements for ductwork don't get any better even with the use of more efficient designs.
The man is running by the beach.
Elders declared illicit drugs were good for your health.
Big Macs are sold in the United States.
A girl in a leather jacket smiles at her friend.