Great Northern Blueprint Number B35-2, map of "O" Line West from Stevens Pass Number 8, undated. Other subject categories: Preliminary Line
Great Northern Blueprint Number B35-2, map of "O" Line West from Stevens Pass Number 8, undated. Other subject categories: Preliminary Line
Great Northern Blueprint Number D-35, map of Cascade Summit to Skykomish, Constructed Line and Profiles, 1894. Other subject categories: Right of Way and Track Map
Great Northern Blueprint Number 1202-20, map of Located "X" Line Running from Long Tunnel at Stevens Pass to Connect with "L" Line at Foot of 2.2% Grade, and List Showing Progress, 1891. Other subject categories: Map
Great Northern Blueprint Number A-9, map of Pacific Extension "L" Line Short Tunnel at Stevens Pass Down West Slope along Tye and Skykomish Rivers, 1891. Other subject categories: Preliminary Line
Great Northern Blueprint Number 1081-19, Map and Profiles, Cascade Tunnel and Switch Backs, Pacific Extension, 1893. Other subject categories: Right of Way and Track Map