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Spokane, Portland and Seattle Railway Engineering Drawing: Switch Box and Details, Bridge 5.1 - Willamette River, north of Willbridge, Oregon, Line Segment 047, Milepost 5.15. Sheet Z - 1 - 5 - 24, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Switch Board, Bridge 9.6 - Columbia River, Vancouver, Washington, Line Segment 047, Milepost 9.31. Sheet Z - 2 - 13 - 18, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Switch Board, Bridge 5.1 - Willamette River, north of Willbridge, Oregon, Line Segment 047, Milepost 5.15. Sheet Z - 1 - 5 - 2, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Swing Span Protection, Bridge A94.9 - John Day River, west of Knappa, Oregon, Line Segment 440, Milepost 94.80, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Swing Motor Gear, Bridge 5.1 - Willamette River, north of Willbridge, Oregon, Line Segment 047, Milepost 5.15. Sheet Z - 1 - 5 - 30, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Swing Motor Change, Bridge 5.1 - Willamette River, north of Willbridge, Oregon, Line Segment 047, Milepost 5.15. Sheet Z - 1 - 5 - 36, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Survey, Bridge 9.6 - Columbia River, Vancouver, Washington, Line Segment 047, Milepost 9.31. Sheet CL - 106 - 19, undated.

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

Spokane, Portland and Seattle Railway Engineering Drawing: Superstructure, Bridge 174.9 - Glade Creek, east of Whitcomb, Washington, Line Segment 047, Milepost 174.91. Sheet JDR - 1 - 4 - 11/74, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Superstructure, Bridge 167.9 - Dead Canyon, east of McCredie, Washington, Line Segment 047, Milepost 167.92. Sheet JDR - 1 - 4 - 11/40, undated.