ocr: EUSGS science fora a changing world Sea-Floor Images and Data from Multibeam Surveys in San Francisco Bay, Southern California, Hawaii,the GulfofMexico,and Lake Tahoe, California-Nevada, ByPeter Dartnell and James V. Gardner Digital Datai SerjesDDS-55 Version 10 1999 03.Deparmente@plmerie US.GeologicalSurvey