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176 Summer view of debris from a large avalanche in White Pine1969-05Image
177 Summer view of debris from a large avalanche in White Pine1969-05Image
178 Summer view of debris from a large avalanche in White Pine1969-05Image
179 Summer view of debris from a large avalanche in White Pine1969-05Image
180 Summer view of debris from a large avalanche in White Pine1969-05Image
181 Summer view of debris from a large avalanche in White Pine1969-05Image
182 Summer view of debris from a large avalanche in White Pine1969-05Image
183 Summer view of debris from a large avalanche in White Pine1969-05Image
184 Summer view of debris from a large avalanche in White Pine1969-05Image
185 Taking samples of different snow layers for weight to find out water content. Right, Ed LaChapelle of Alta, Utah.1955-01Image
186 Taking snow out of tube to weigh for moisture content.1955-01Image
187 Terminus of the Argenta avalanche slide.1940; 1941; 1942; 1943; 1944; 1945; 1946; 1947; 1948; 1949; 1950; 1951; 1952; 1953; 1954; 1955; 1956; 1957; 1958; 1959; 1960; 1961; 1962; 1963; 1964; 1965; 1966; 1967; 1968; 1969Image
188 Testing snow penetration using a penetrometer at Alta. Foreground, Dick Stillman of Berthoud Pass, Co.1955-01Image
189 Trucks parked on a ski run during the summer months.1970Image
190 U.S. Army -- Dugway Proving Grounds -- coop with the Wasatch National Forest Service in testing the 4-2 mortar.1966-03Image
191 U.S. Army -- Dugway Proving Grounds -- coop with the Wasatch National Forest Service in testing the 4-2 mortar.1966-03Image
192 U.S. Army -- Dugway Proving Grounds -- coop with the Wasatch National Forest Service in testing the 4-2 mortar.1966-03Image
193 U.S. Army -- Dugway Proving Grounds -- coop with the Wasatch National Forest Service in testing the 4-2 mortar.1966-03Image
194 U.S. Army -- Dugway Proving Grounds -- coop with the Wasatch National Forest Service in testing the 4-2 mortar.1966-03Image
195 U.S. Army -- Dugway Proving Grounds -- coop with the Wasatch National Forest Service in testing the 4-2 mortar.1966-03Image
196 U.S. Army and U.S. Forest Service cooperate in testing the 75mm recoilless rifle used in avalanche control.1963Image
197 U.S. Army and U.S. Forest Service employees gathered around the 105mm recoilless rifle.1956Image
198 Unidentified avalanche1939Image
199 "Hellgate" slide which buried many cars1948Image
200 105mm recoilless rifle firing for avalanche control near Alta Ski Area. (blurred photograph is result of firing)1956Image
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