The chart shows the volume (tonnage) of maritime trade from all points south of San Francisco to ports along the U.S. West Coast. The use for the chart was to support the decision-making process for selecting a new harbor of refuge and breakwater on the Pacific Ocean between the Strait of Juan de Fuca and San Francisco.
Tonnage Chart of Coastwise Commerce North of San Francisco -California
From "Harbor of Refuge on the Pacific Coast Appendix PP of the Annual report to the Chief of Engineers for 1881. Washington: Government Printing Office. 1881.
PUBLICATION DATE: 1878
GEOGRAPHIC AREA: United States
BODY OF WATER: Pacific Ocean
CONDITION: Very good.
 Clean, solid. Minor age toning.
COLORING: None
ENGRAVER: 
SIZE: 8
" x
15 "
ITEM PHYSICAL LOCATION: 3
PRICE: $320
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