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Fig. 9. Reflection seismograph map (1936) showing contours on top of the James Limestone. Contour interval, 50 ft. (From Walker, 1953.)

Fig. 10. Subsurface map on top of the James Limestone defined by drilling as of 1953. Contour interval, 25 ft. (from Walker, 1953.)

Fig. 11. Reflection seismograph map (1944) showing contours on the Bodcaw sandstone in the Cotton Valley Group. Contour interval, 50 ft. (From Walker, 1953.)

Fig. 12. Observe gravity map (1947) of the Ruston field. Contour interval, 0.2 mgal. (From Walker, 1953.)