Intitial reports, Broken Ridge and Ninetyeast Ridge covering Leg 121 of the cruises of the Drilling Vessel, JOIDES Resolution, Fremantle, Australia, to Port of Singapore, Singapore, Sites 752-758, 30 April to 28 June 1988 / participating ascientists John Peirce [and others] ; shipboard staff scientist Elliott Taylor ; Elsa Kapitan Mazzullo, editor