Hällrisningar - Rock Art - Petroglyphs
American Indian Rock Art in Oregon and the Pacific Northwest. - Oregon Archaeological society, 2008 : winter)
Nine Mile Canyon + (Sökn) Petroglyph site
Fowke, Gerard
Stone Art. - 131 s. : ill.
= Sid. 47-178 i: 13th Annual Report of the Bureau of American Ethnology for the years 1891-1892. - Washington : BAE : Smithsonian Institution, 1896.