Sylvester, A. G. (1978): Petrography of volcanic ashes in deep-sea cores near Jan-Mayen Island; sites 338, 345-350 DSDP Leg 38. Texas A & M University, Ocean Drilling Program, College Station, TX, United States, In: White, S. M. (editor), Supko, P. R. (editor), Natland, J. (editor), Gardner, J. (editor), Herring, J. (editor), Initial reports of the Deep Sea Drilling Project; Supplement to volumes XXXVIII, XXXIX, XL, and XLI, 38-41 (Supplement), 101-109, georefid:1979-010681