Spokane, Portland and Seattle Railway Engineering Drawing: Wall Details, Tunnel - Nehalem Boom Crossing, United Junction, Oregon, Line Segment 442, Milepost 10.19. Sheet 23286, undated.

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.

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: 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: 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: Frame Details, Tunnel - Nehalem Boom Crossing, United Junction, Oregon, Line Segment 442, Milepost 10.19. Sheet 23284, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Frame Details, Tunnel - Nehalem Boom Crossing, United Junction, Oregon, Line Segment 442, Milepost 10.19. Sheet 23285, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Foundation Data, Tunnel - Nehalem Boom Crossing, United Junction, Oregon, Line Segment 442, Milepost 10.19. Sheet 23283, undated.