Various shots of stook threshing on the Prairies, tractors, hay wagon being pulled by horses. CUs of farmer's face, typically Western Canadian. Shots of tractor hauling threshing unit to new location. Numerous shots of seismic unit at work on the Prairies. Shots of roughnecks erecting portable drill tower and working in drill tower. Several shots of field unit at work with seismicologists examining drill samples. Several interior laboratory (field unit) shots of officer examining drill sample under microscope and making other tests.