http://pec.lib.wvu.edu/record/P93361965The Humble way.Serial. Printed Ephemera Collection has: v.4:no.2 (1965:spring). Issue for spring 1965 includes article: Showboat, ahoy! by Frank Hill.Humble Oil and Refining Company.Humble Oil and Refining Company--Periodicals.Rhododendron (Showboat) Petroleum industry and trade--United States--Periodicals.14256