File:Alice Dowse Weeks, Geologist, operating an ultrasonic generator. Rapid Rock Analysis Laboratory, USGS Geologic Division, Washington, D.C. 1958.jpg
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![File:Alice Dowse Weeks, Geologist, operating an ultrasonic generator. Rapid Rock Analysis Laboratory, USGS Geologic Division, Washington, D.C. 1958.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Alice_Dowse_Weeks%2C_Geologist%2C_operating_an_ultrasonic_generator._Rapid_Rock_Analysis_Laboratory%2C_USGS_Geologic_Division%2C_Washington%2C_D.C._1958.jpg/776px-Alice_Dowse_Weeks%2C_Geologist%2C_operating_an_ultrasonic_generator._Rapid_Rock_Analysis_Laboratory%2C_USGS_Geologic_Division%2C_Washington%2C_D.C._1958.jpg?20230312064045)
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