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#18535 Columbia River, John Day Dam to Blalock, Oregon - Washington Choose Chart Type:Overlay Chart (transparent) Southern Alaska Chart - and#18535 Columbia River, John Day Dam to Blalock, Oregon Washington Chart Vellum Paper Test Chart Port Pilotage test chart Transparent vellum paper Best for use as test chart for USCG testing Chart file is most recent and updated version Paper has good transparency Marks well with pencil with low smudge factor Pencil lead erases well Base print has fine line detail Meets USCG paper requirements for pilotage test White Paper Practice Chart Port pilotage