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Spokane, Portland and Seattle Railway Engineering Drawing: Operating House/Railroad Signal House, Bridge T0.4 - Columbia River, south of Wishram, Washington, Line Segment 053, Milepost 0.37. Sheet WX - 208, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Operating House, Bridge 8.8 - Oregon Slough, north of North Portland Junction, Oregon, Line Segment 047, Milepost 8.62. Sheet Z - 3 - 22 - 23, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Operating House, Bridge 8.8 - Oregon Slough, north of North Portland Junction, Oregon, Line Segment 047, Milepost 8.62. Sheet Z - 3 - 25 - 10, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Operating House, Bridge 5.1 - Willamette River, north of Willbridge, Oregon, Line Segment 047, Milepost 5.15. Sheet Z - 1 - 2 - 21, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Operating House Support, Bridge 9.6 - Columbia River, Vancouver, Washington, Line Segment 047, Milepost 9.31. Sheet Z - 1 - 9 - 18, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Operating House Floor Beams, Bridge 5.1 - Willamette River, north of Willbridge, Oregon, Line Segment 047, Milepost 5.15. Sheet Z - 1 - 1 - 14, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Opening Tramway, Bridge 15.5 - Tramway Opening, east of McLaughlin, Washington, Line Segment 047, Milepost 15.51. Sheet N - 1 - 1, undated.