U.S. Geological Survey:
#TBT: Cheyenne, WY
U.S. Geological Survey:
John Wesley Powell
U.S. Geological Survey:
Twisted Tracks
U.S. Geological Survey:
Mount St. Helens Eruption — 1980
U.S. Geological Survey:
Devil's Gate Bridge
U.S. Geological Survey:
Northridge, CA Earthquake 1994
U.S. Geological Survey:
#TBT : Cape Cod, Massachusetts
U.S. Geological Survey:
Nashua Valley, Massachusetts
U.S. Geological Survey:
Mole Tracks
U.S. Geological Survey:
TBT - USGS Copy Camera
U.S. Geological Survey:
TBT: St. Francis Dam Flood
U.S. Geological Survey:
#TBT — Hawaii Volcanoes National Park (1969-1971)
U.S. Geological Survey:
#TBT : Volcanic Roadblock
U.S. Geological Survey:
TBT — Shepard Glacier (1913)
U.S. Geological Survey:
TBT USGS Library in Hooe Building, Washington, DC, 1917
U.S. Geological Survey:
Trust
U.S. Geological Survey:
Florence Bascom
U.S. Geological Survey:
#TBT Mount St. Helens north flank at timberline 50 years ago, Skamania County, Washington. August, 1964.
U.S. Geological Survey:
TBT: The 1870 Survey Crew
U.S. Geological Survey:
We Have a Lava Love for Ya!
U.S. Geological Survey:
Happy 224th Anniversary Rhode Island!
U.S. Geological Survey:
San Francisco, California, 1899, 15-minute topographic map
U.S. Geological Survey:
Historia Mundi (1530) (Translated: History of the World)
U.S. Geological Survey:
USGS in Spaaaaace!
U.S. Geological Survey:
Mapping the USA
U.S. Geological Survey:
We Celebrate The Opening of Disneyland On This Day in 1955 with Topographic Maps.
U.S. Geological Survey:
TBT Carlsbad Caverns 1923
U.S. Geological Survey:
TBT: Glacier National Park, MT with Game McGimsey on the summit of Mount Cleveland,1983
U.S. Geological Survey:
Eocene Sunfish
U.S. Geological Survey:
Strike a Pose
