Barrett, T J (1983): (Table 1) 87Sr/86Sr ratios, Rb and Sr concentrations, and sample descriptions at DSDP Holes 69-504B and 70-504B. PANGAEA, https://doi.org/10.1594/PANGAEA.816537, In supplement to: Barrett, TJ (1983): Strontium- and lead-isotope composition of some basalts from Deep Sea Drilling Project Hole 504B, Costa Rica Rift, Legs 69 and 70. In: Cann, JR; Langseth, MG; Honnorez, J; Von Herzen, RP; White, SM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 69, 643-650, https://doi.org/10.2973/dsdp.proc.69.138.1983