Gravity Observation In Progress - Florida, July 1964
Photo Courtesy Billy Mayo

Lt Mayo Leaving Observation Site in Thermopolis, WY
Photo Courtesy Billy Mayo

Gravity Was Observed in Hawaii Also - Ronald Friez in Photo, October 1966
Photo Courtesy Billy Mayo

Gravity Observer in Alabama - Ronald Friez in Photo, January 1967
Photo Courtesy Billy Mayo

Walt Spita Making An Observation, January 1967
Photo Courtesy Billy Mayo

Billy Mayo & Dave Hamlin Touring Mexico City With Gravimeters, April 1967
Photo Courtesy Billy Mayo

Lt Mayo Observing Gravity in Point Barrow, Alaska, April 1967
Photo Courtesy Billy Mayo

Lt Yagmin Using Helicopter Transport in Montana, September 1967
Photo Courtesy Billy Mayo

Lt Henrich With Team Member Making Observations in Wyoming's High Country, 1970
Photo Courtesy Billy Mayo