Northern Pacific Engineering Drawing: Yardmaster Tower at Pasco, Washington, prepared in 1972. Burlington Northern File Number 9812, Reference Number 10101, Sheet 002.

Northern Pacific Engineering Drawing: Yardmaster Tower at Pasco, Washington, prepared in 1972. Burlington Northern File Number 9812-E1, Reference Number 10103.

Northern Pacific Engineering Drawing: Yardmaster Tower at Pasco, Washington, prepared in 1972. Burlington Northern File Number 9812-3, Reference Number 10101.

Northern Pacific Engineering Drawing: Yardmaster Tower at Pasco, Washington, prepared in 1972. Burlington Northern File Number 9812-1, Reference Number 10101.

Northern Pacific Engineering Drawing: Yardmaster Tower (also Duluth, Minnesota) at Pasco, Washington, prepared in 1969. Burlington Northern File Number 9812, Reference Number 10109, Sheet E1.

Northern Pacific Engineering Drawing: Yardmaster Tower (also Duluth, Minnesota) Section Drawing at Pasco, Washington, prepared in 1969. Burlington Northern File Number 9812, Reference Number 10110, Sheet 001.

Northern Pacific Engineering Drawing: Yardmaster Tower (also Duluth, Minnesota) at Pasco, Washington, prepared in 1969. Burlington Northern File Number 9812, Reference Number 10110, Sheet 002.

Northern Pacific Engineering Drawing: Yardmaster Tower (also Duluth, Minnesota) at Pasco, Washington, prepared in 1969. Burlington Northern File Number 9812, Reference Number 10110, Sheet 001.

Northern Pacific Engineering Drawing: Yardmaster Tower (also Duluth, Minnesota) at Pasco, Washington, prepared in 1969. Burlington Northern File Number 9812, Reference Number 10109, Sheet 001.

Northern Pacific Engineering Drawing: Yard Office and Tower at Pasco, Washington, undated. Burlington Northern File Number 4628, Reference Number 101.