Morton, Andrew C (1984): (Table 2) Volcanic glass abundance at DSDP Hole 81-552A. PANGAEA, https://doi.org/10.1594/PANGAEA.806726, In supplement to: Morton, AC (1984): Coarse fraction of Plio-Pleistocene sediments from Deep Sea Drilling Project Hole 552A, Northeast Atlantic. In: Roberts, DG; Schnittker, D; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 81, 663-667, https://doi.org/10.2973/dsdp.proc.81.122.1984