U.S. Geological Survey:
Rock Core Lab Shelves
U.S. Geological Survey:
Yosemite Falls
U.S. Geological Survey:
Studying Alaska Geology
U.S. Geological Survey:
The Importance of Platinum Elements
U.S. Geological Survey:
Happy 224th Anniversary Rhode Island!
U.S. Geological Survey:
Copper -- A Metal for the Ages
U.S. Geological Survey:
El Capitan
U.S. Geological Survey:
Syrah Grapes on the Vine
U.S. Geological Survey:
Rainbow Point
U.S. Geological Survey:
Colorful Mountains