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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- Item435774 - Great Northern Railway Authorization for Expenditure (AFE) 17618, Great Falls, Montana, 1921.
- Item435775 - Great Northern Railway Authorization for Expenditure (AFE) 17619, Black Eagle, Montana, 1921.
- Item435776 - Great Northern Railway Authorization for Expenditure (AFE) 17626, Delta, Washington, 1921.
- Item435777 - Great Northern Railway Authorization for Expenditure (AFE) 17627, 1921.
- Item435778 - Great Northern Railway Authorization for Expenditure (AFE) 17628, 1921.
- Item435779 - Great Northern Railway Authorization for Expenditure (AFE) 17629, 1921.
- Item435780 - Great Northern Railway Authorization for Expenditure (AFE) 17630, 1921.
- Item435781 - Great Northern Railway Authorization for Expenditure (AFE) 17651, Great Falls, Montana, 1921.
- Item435782 - Great Northern Railway Authorization for Expenditure (AFE) 17693, Burlington, Washington, 1921.
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