Original oil and gas trade magazine vintage ad for GEOPHYSICAL ASSOCIATES INTERNATIONAL, INC. Main office was located at 5300 Brownway Street, Houston, TX. and at 340 Esperson Building, Houston, TX. Dr. L. L. Nettleton, E. Joe Shimek, Hart Brown, Dr. N. C. Steenland. Exploration will bring new wealth complete coordinated geophysical services and interpretation. Seismic exploration. Gravity meter surveys. Magnetic surveys. This unique 1958 old oilfield petroleum exploration magazine advertisement would display beautifully matted and framed.