Relief shown by hachures, form lines, and spot heights. Depths shown by soundings and isolines. "The triangulation, topography, and hydrography were surveyed by Cleveland Rockwell ... ; verification of hydrography by Lieut. Comd'r. W.H. Brownson. Original chart no. "660." Renumbered chart no. "6088" in pencil. "Printed August 1889." Department of the Army, Portland District, Corps of Engineers; gift; 1989/11/07; 19702
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