Railroad Archives Online
- ArquivoE0045 - Great Northern Railway Authority for Expenditure Collection
- Série003 - Great Northern Railway Company (U.S.)
- Subsérie002 - Authorization for Expenditure
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- Item435965 - Great Northern Railway Authorization for Expenditure (AFE) 18800, Pateros, Washington, 1921.
- Item435966 - Great Northern Railway Authorization for Expenditure (AFE) 18816, Judith Gap, Montana, 1921.
- Item435967 - Great Northern Railway Authorization for Expenditure (AFE) 18818, 1921.
- Item435968 - Great Northern Railway Authorization for Expenditure (AFE) 18820, Cascade Tunnel, Washington, 1921.
- Item435969 - Great Northern Railway Authorization for Expenditure (AFE) 18822, 1921.
- Item435970 - Great Northern Railway Authorization for Expenditure (AFE) 18824, Abbotsford, British Columbia, 1921.
- Item435971 - Great Northern Railway Authorization for Expenditure (AFE) 18826, Haskett, Manitoba, 1921.
- Item435972 - Great Northern Railway Authorization for Expenditure (AFE) 18833, Bellingham, Washington, 1921.
- Item435973 - Great Northern Railway Authorization for Expenditure (AFE) 18834, Havre, Montana, 1921.
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