Original oil and gas trade magazine vintage ad for NATIONAL GEOPHYSICAL COMPANY, INC. Main office was located at 8800 Lemmon Avenue, Dallas, TX. Other offices were located in Houston, TX, Midland, TX, Denver, CO, and Shreveport, LA. How this three year cruise proved a point. Barges, especially designed by National for seismic exploration in shallow water bays and protected waters. This unique 1958 old oilfield petroleum drilling magazine advertisement would display beautifully matted and framed. Nice graphics.