Northern Pacific Engineering Drawing: Sand Facilities Storage and Dispensing Silo at Helena, Montana, prepared in 1957. Burlington Northern File Number 4618, Reference Number 10103.

Northern Pacific Engineering Drawing: Sand Facilities Sand Elevating Tank at Helena, Montana, prepared in 1957. Burlington Northern File Number 4618, Reference Number 10103.

Northern Pacific Engineering Drawing: Sand Facilities General Assembly at Helena, Montana, prepared in 1957. Burlington Northern File Number 4618, Reference Number 10104.

Northern Pacific Engineering Drawing: Sand Facilities at Helena, Montana, prepared in 1960. Burlington Northern File Number 4618, Reference Number 10103, Sheet S-1.

Northern Pacific Engineering Drawing: Soil Can Cleaning Building at Helena, Montana, prepared in 1948. Burlington Northern File Number 4749, Reference Number 10102, Sheet 001.

Northern Pacific Engineering Drawing: unnamed structure at Helena, Montana, prepared in 1950. Burlington Northern File Number 4616, Reference Number 10111.

Northern Pacific Engineering Drawing: unnamed structure at Helena, Montana, prepared in 1950. Burlington Northern File Number 4616, Reference Number 10111.

Northern Pacific Engineering Drawing: unnamed structure at Helena, Montana, prepared in 1950. Burlington Northern File Number 4616, Reference Number 10111.

Northern Pacific Engineering Drawing: unnamed structure at Helena, Montana, prepared in 1956. Burlington Northern File Number 4616, Reference Number 10104, Sheet 003.

Northern Pacific Engineering Drawing: unnamed structure at Helena, Montana, prepared in 1960. Burlington Northern File Number 4616, Reference Number 10103, Sheet B-1.