File:Seismic sensors are loaded on a Sikorsky CH-3E of the 21st SOS at Nakhon Phanom RTAFB, circa in 1969.jpg
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![File:Seismic sensors are loaded on a Sikorsky CH-3E of the 21st SOS at Nakhon Phanom RTAFB, circa in 1969.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/7/73/Seismic_sensors_are_loaded_on_a_Sikorsky_CH-3E_of_the_21st_SOS_at_Nakhon_Phanom_RTAFB%2C_circa_in_1969.jpg/776px-Seismic_sensors_are_loaded_on_a_Sikorsky_CH-3E_of_the_21st_SOS_at_Nakhon_Phanom_RTAFB%2C_circa_in_1969.jpg?20210604060113)
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