Relief shown by hachures. Depths shown by soundings. Includes views: Trinidad Head -- Cape Mendocino. "Verified by I.I. Stevens, Lieut. U.S. Engrs. & Bvt. Major, asst. in charge of office." Includes sailing directions from Cape Mendocino to the Umpqua River. Shows tracks of U.S. Coast Survey Schooner Ewing.