A bison is squeezed into a chute to take a blood sample as part of the
brucellosis eradication program.
Cutting through a 33-foot drift at Lake Helen, Lassen Volcanic National
Park.
Expert snow rangers from Snoqualmie National Forest drill Mount Rainier
National Park rangers in emergency procedures to probe for an avalanche
victim.
Archaeologist and assistant plot the Step House Ruins at the Wetherill
Mesa laboratory.
The Cliff Palace at Mesa Verde National Park, one of the best preserved
prehistoric cliff dwellings in the United States.
