Rose, William I., Jr.; Bornhorst, Theodore J.; Drexler, John William (1982): Preliminary correlation of Quaternary volcanic ashes from the Middle America Trench off Guatemala, Deep Sea Drilling Project Leg 67. Texas A & M University, Ocean Drilling Program, College Station, TX, United States, In: Aubouin, Jean, von Huene, Roland, Azema, Jacques, Coulbourn, William T., Cowan, Sarrel S., Curiale, Joseph A., Dengo, Carlos A., Faas, Richard W., Harrison, William E., Hesse, Reinhard, Ladd, John W., Muzylov, Nikita, Shiki, Tsunemasa, Thomson, Peter R., Westberg, M. Jean, Orlofsky, Susan (editor), Initial Reports of the Deep Sea Drilling Project covering Leg 67 of the cruises of the drilling vessel Glomar Challenger, Manzanillo, Mexico to Puntarenas, Costa Rica, 67, 493-495, georefid:1983-011506