Northern Pacific Engineering Drawing: Slab Cover Down Stream, Culvert south of Empire, west of Empire, Washington, Line Segment 046, Milepost 4.34. Sheet 442 - 59, undated.

Northern Pacific Engineering Drawing: Specification Plan Foundation, Track Scale, Prineville, Oregon, Line Segment 999. Sheet K - 6 - 20, undated.

Northern Pacific Engineering Drawing: Standard Plan Foundation (cancelled), Scale. Sheet K - 6 - 20, undated.

Northern Pacific Engineering Drawing: Standard Plan Foundation, Track Scale, Prineville, Oregon, Line Segment 999. Sheet K - 6 - 20, undated.

Northern Pacific Engineering Drawing: Standard Plan Foundation, Scale. Sheet K - 6 - 20, undated.

Northern Pacific Engineering Drawing: Standard Plan Foundation, Scale. Sheet K - 6 - 20, undated.

Northern Pacific Engineering Drawing: Standard Plan Foundation, Scale. Sheet K - 6 - 20, undated.

Northern Pacific Engineering Drawing: Standard Plan Foundation, Scale. Sheet K - 6 - 20, undated.

Northern Pacific Engineering Drawing: Standard Plan of Foundation, Scale, undated.

Northern Pacific Engineering Drawing: Standard Plan of Track Scale, Track Scale, undated.