Author Jeff A. Spencer, a petroleum geologist and oilfield historian, has authored several papers using vintage postcards to illustrate the petroleum industry�s history and growth....view moreAuthor Jeff A. Spencer, a petroleum geologist and oilfield historian, has authored several papers using vintage postcards to illustrate the petroleum industry�s history and growth. He currently serves as a vice president of the Petroleum History Institute and is coauthor of Arcadia�s Images of America: Ohio Oil and Gas.view less