Original oil and gas trade magazine vintage ad for SEISMOGRAPH SERVICE CORPORATION of Tulsa, OK., Continuous Velocity Logging A Sound Method of Examining Your Well. Seismic and Gravity Surveys, Pilot Crews, Lorac, Continuous Velocity Logging. Shown is the data of a test conducted by Magnolia Petroleum Company. Subsidiaries: SSC of Canada, SSC of Colombia, SSC of Mexico, SSC of Venezuela, SSC Seismograph Service Limited - England, Compagnie Francaise de Prospections Sismique. Unique 1955 petroleum oilfield drilling and seismic industry magazine advertisement. On the reverse side is an ad for MACK TRUCKS, Empire State Building, New York City, NYC, NY. It's engineered to get the job done right. Pictured is G.L. Fife, Jr., of G.L. Fife & Son, Natchez, Mississippi with his Mack Truck. approximate size 9 x 12 inches.