11. Geologic map of the Sasquatch Steps area, north flank of Mount St. Helens, Washington Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : Map Distribution [distributor]. Resource Type: Map Access & Availability: Loading
12. Geologic map of the Snoqualmie Pass 30 x 60 minute quadrangle, Washington Publication/Creation: Denver, CO : Information Services [distributor] Resource Type: Map Access & Availability: Loading
13. Geologic map of upper Eocene to Holocene volcanic and related rocks of the Cascade Range, Oregon Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : Map Distribution [distributor] Resource Type: Map Access & Availability: Loading