Original oil and gas trade magazine vintage ad for NATIONAL LEAD COMPANY of Houston, TX. Baroid Division. Baroid Oil Muds give field-proved performance. Consistent on the job proof that they can solve difficult drilling and completion problems. Used at Matagorda County, Texas, Chief Mountain, Alberta, South Timbalier, Offshore Louisiana, Los Angeles County California and more. This unique 1962 old oilfield petroleum industry magazine advertisement would display fantastic matted and framed. Two-page gatefold technical advertisement.