Northern Pacific Engineering Drawing: Depot at Helena, Montana, prepared in 1903. Burlington Northern File Number 4616, Reference Number 10105.

Northern Pacific Engineering Drawing: Depot Water Supply for Locomotives at Helena, Montana, prepared in 1939. Burlington Northern File Number 4752, Reference Number 10103, Sheet 001.

Northern Pacific Engineering Drawing: Depot at Helena, Montana, prepared in 1956. Burlington Northern File Number 4616, Reference Number 10104, Sheet 002.

Northern Pacific Engineering Drawing: Depot at Helena, Montana, prepared in 1956. Burlington Northern File Number 4616, Reference Number 10109, Sheet 001.

Northern Pacific Engineering Drawing: Depot at Helena, Montana, prepared in 1956. Burlington Northern File Number 4616, Reference Number 10109, Sheet 003.

Northern Pacific Engineering Drawing: Depot at Helena, Montana, prepared in 1957. Burlington Northern File Number 4616, Reference Number 10102, Sheet B-2.

Northern Pacific Engineering Drawing: Depot at Helena, Montana, prepared in 1960. Burlington Northern File Number 4615, Reference Number 10105, Sheet 008.

Northern Pacific Engineering Drawing: Depot Traffic Department Office at Helena, Montana, prepared in 1960. Burlington Northern File Number 4616, Reference Number 10110, Sheet 003.

Northern Pacific Engineering Drawing: Depot Traffic Department Office at Helena, Montana, prepared in 1960. Burlington Northern File Number 4616, Reference Number 10110, Sheet 002.

Northern Pacific Engineering Drawing: Depot Traffic Department Office at Helena, Montana, prepared in 1960. Burlington Northern File Number 4616, Reference Number 10110, Sheet 001.