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Spokane, Portland and Seattle Railway Engineering Drawing: Pre - Boring/Bents, Bridge U16.7 - Underpass, west of United Junction, Oregon, Line Segment 442, Milepost 16.62. Sheet RS - 270D, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Pre - Boring/Bents, Bridge U16.7 - Underpass, west of United Junction, Oregon, Line Segment 442, Milepost 16.62. Sheet RS - 270E, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Power Supply - DC, Bridge 9.6 - Columbia River, Vancouver, Washington, Line Segment 047, Milepost 9.31. Sheet EB 102B, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Power House, Bridge 5.1 - Willamette River, north of Willbridge, Oregon, Line Segment 047, Milepost 5.15. Sheet Z - 1 - 5 - 21, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Position of Bearing as Built, Bridge 42.7 - Duncan Creek, east of Skamania, Washington, Line Segment 047, Milepost 42.67. Sheet N - 1 - 10, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Portal/Struts, Bridge 8.8 - Oregon Slough, north of North Portland Junction, Oregon, Line Segment 047, Milepost 8.62. Sheet Z - 3 - 21 - 7, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Portal/Cross Frame, Bridge T0.4 - Columbia River, south of Wishram, Washington, Line Segment 053, Milepost 0.37. Sheet Z - 5 - 3, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Portal, Bridge 8.8 - Oregon Slough, north of North Portland Junction, Oregon, Line Segment 047, Milepost 8.62. Sheet Z - 2 - 18 - 8, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Portal, Bridge 5.1 - Willamette River, north of Willbridge, Oregon, Line Segment 047, Milepost 5.15. Sheet Z - 1 - 6 - 7, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Portal Details, Bridge 9.6 - Columbia River, Vancouver, Washington, Line Segment 047, Milepost 9.31. Sheet Z - 2 - 16 - 6, undated.