Maxwell, Arthur E.; Von Herzen, Richard P.; Andrews, James E.; Boyce, Robert E.; Milow, E. Dean; Hsu, Kenneth J.; Percival, Stephen F.; Saito, Tsunemasa (1970): Site 20. Texas A & M University, Ocean Drilling Program, College Station, TX, United States, In: Maxwell, Arthur E., Von Herzen, Richard P., Andrews, James E., Boyce, Robert E., Milow, E. Dean, Hsu, Kenneth J., Percival, Stephen F., Saito, Tsunemasa, Initial Reports of the Deep Sea Drilling Project; covering Leg 3 of the cruises of the drilling vessel "Glomar Challenger," Dakar, Senegal to Rio de Janeiro, Brazil December 1968 to January 1969, 3, 319-366, georefid:1983-023921