Great Northern Engineering Drawing: Signal Maintainer and Track Forces Building, Metal 20 Foot X 56 Foot at Harlem, Montana (also at Brookston, Minnesota), prepared in 1964. Burlington Northern File Number 9665-M1, Reference Number 10110.

Great Northern Engineering Drawing: Signal Maintainer and Track Forces Building, Metal 20 Foot X 56 Foot Standard Material Building at Harlem, Montana (also Brookston, Minnesota), prepared in 1964. Burlington Northern File Number 9665-1, Reference Number 10108.

Great Northern Engineering Drawing: Signal Maintainer and Track Forces Building, Metal 20 Foot X 56 Foot Electrical Material Building at Harlem, Montana (also Brookston, Minnesota), prepared in 1967. Burlington Northern File Number 9665-E1, Reference Number 10109.