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Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 9.6 - Columbia River, Vancouver, Washington, Line Segment 047, Milepost 9.31, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 9.6 - Columbia River, Vancouver, Washington, Line Segment 047, Milepost 9.31, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 9.6 - Columbia River, Vancouver, Washington, Line Segment 047, Milepost 9.31, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 9.6 - Columbia River, Vancouver, Washington, Line Segment 047, Milepost 9.31, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 9.6 - Columbia River, Vancouver, Washington, Line Segment 047, Milepost 9.31, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 8.8 - Oregon Slough, North of North Portland Junction, Washington, Line Segment 047, Milepost 8.62. Sheet G - 4 - 8, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 8.8 - Oregon Slough, North of North Portland Junction, Washington, Line Segment 047, Milepost 8.62. Sheet G - 4 - 8, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 8.8 - Oregon Slough, North of North Portland Junction, Washington, Line Segment 047, Milepost 8.62. Sheet , 1912.

Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 8.8 - Oregon Slough, north of North Portland Junction, Oregon, Line Segment 047, Milepost 8.62. Sheet Z - 3 - 26 - 10 - 6, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Soundings, Bridge 8.8 - Oregon Slough, north of North Portland Junction, Oregon, Line Segment 047, Milepost 8.62. Sheet Z - 3 - 26 - 10 - 2, undated.