Great Northern Engineering Drawing: Tie Treating Plant - Retort House at Somers, Montana, prepared in 1929. Burlington Northern File Number 8491-2, Reference Number 10112.

Great Northern Engineering Drawing: Tie Treating Plant - Retort House at Somers, Montana, prepared in 1944. Burlington Northern File Number 8491-1, Reference Number 10107.

Great Northern Engineering Drawing: Tie Treating Plant - Retort House at Somers, Montana, prepared in 1944. Burlington Northern File Number 8491-3, Reference Number 10107.

Great Northern Engineering Drawing: Tie Treating Plant Air Compressor Foundation at Hillyard, Washington, prepared in 1957. Burlington Northern File Number B-505, Reference Number 10103.

Great Northern Engineering Drawing: Tie Treating Plant Frame Addition to Adzing, Boring and Incising Plant at Somers, Montana, prepared in 1958. Burlington Northern File Number 9607-1, Reference Number 10104.

Great Northern Engineering Drawing: Tie Treating Plant at Somers, Montana, prepared in 1970. Burlington Northern File Number 9788-E1, Reference Number 10110.

Great Northern Engineering Drawing: Tie Treating Plant at Somers, Montana, prepared in 1970. Burlington Northern File Number 9788-E1, Reference Number 10110.

Great Northern Engineering Drawing: Tie Treating Plant at Somers, Montana, prepared in 1970. Burlington Northern File Number 9788-5, Reference Number 10106.

Great Northern Engineering Drawing: Tie Treating Plant at Somers, Montana, prepared in 1970. Burlington Northern File Number 9788-1, Reference Number 10105.

Great Northern Engineering Drawing: Tie Treating Plant at Somers, Montana, prepared in 1970. Burlington Northern File Number 9788-2, Reference Number 10105.