Spokane, Portland and Seattle Railway Engineering Drawing: Maximum Toe Bearing, Tunnel - Nehalem Boom Crossing, United Junction, Oregon, Line Segment 442, Milepost 10.19. Sheet 20011, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Nehalem Boom Over - Crossing, Tunnel - Nehalem Boom Crossing, United Junction, Oregon, Line Segment 442, Milepost 10.19. Sheet B - 290, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Plan and Elevation, Tunnel - Nehalem Boom Crossing - Map, United Junction, Oregon, Line Segment 442, Milepost 10.19. Sheet 23282, 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 - 270A, 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 - 270B, 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: 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 - 270C, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Pre - Boring/Cap/Sill, Bridge U12.0 - Details, west of United Junction, Oregon, Line Segment 442, Milepost 12.00. Sheet RS - 265, 1946.

Spokane, Portland and Seattle Railway Engineering Drawing: Standard Expansion Joint Detail, Tunnel - Nehalem Boom Crossing, United Junction, Oregon, Line Segment 443, Milepost 10.19. Sheet 22970, undated.