Railroad Archives Online
- CollectionE0045 - Great Northern Railway Authority for Expenditure Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1002 - Authorization for Expenditure
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- Item332828 - Great Northern Railway Authorization for Expenditure (AFE) 32541, Sioux Falls, South Dakota, 1926.
- Item332829 - Great Northern Railway Authorization for Expenditure (AFE) 32941, Sioux Falls, South Dakota, 1926.
- Item332830 - Great Northern Railway Authorization for Expenditure (AFE) 32941, Sioux Falls, South Dakota, 1926.
- Item332831 - Great Northern Railway Authorization for Expenditure (AFE) 33160, Sioux Falls, South Dakota, 1926.
- Item332832 - Great Northern Railway Authorization for Expenditure (AFE) 33429, Sioux Falls, South Dakota, 1926.
- Item332833 - Great Northern Railway Authorization for Expenditure (AFE) 35127, Sioux Falls, South Dakota, 1927.
- Item332834 - Great Northern Railway Authorization for Expenditure (AFE) 35130, Sioux Falls, South Dakota, 1927.
- Item332835 - Great Northern Railway Authorization for Expenditure (AFE) 36484, Sioux Falls, South Dakota, 1928.
- Item332836 - Great Northern Railway Authorization for Expenditure (AFE) 37199, Sioux Falls, South Dakota, 1928.
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