Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) J.B. Keene,"Cherts and Porcellanites from the North Pacific, DSDP, Leg 32",Initial Reports of the Deep Sea Drilling Project,,U.S. Government Printing Office,1975-08,,,,https://cir.nii.ac.jp/crid/1360284975449528704,https://doi.org/10.2973/dsdp.proc.32.114.1975