Seeking homestead approval for Charles Johnson

How can I find homestead and early settler information, including plat maps, for Jefferson County, WA area, 1875-1910? I am seeking information on homesteading and early settlement of Tarboo/Quilcene area, Olympic Peninsula, Washington State.  I'd love to see old plat maps of my area. I am trying to reconstruct who lived here, when, in early settlement.  Twana tribe cites this area as northern most fishing and hunting grounds, and at least one Twana home is recorded as being at the head of Dabob/Tarboo Bay into the early 1900's.  I want to document the European settler early history in the area, which included my grandfather, Charles Johnson"s, homestead approval in 1889.