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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- Item422410 - Great Northern Railway Authorization for Expenditure (AFE) 26522, 1924.
- Item422411 - Great Northern Railway Authorization for Expenditure (AFE) 26676, 1924.
- Item422412 - Great Northern Railway Authorization for Expenditure (AFE) 26635, 1924.
- Item422413 - Great Northern Railway Authorization for Expenditure (AFE) 27527, 1924.
- Item422414 - Great Northern Railway Authorization for Expenditure (AFE) 28072, 1925.
- Item422415 - Great Northern Railway Authorization for Expenditure (AFE) 27738, 1924.
- Item422416 - Great Northern Railway Authorization for Expenditure (AFE) 27635, 1924.
- Item422417 - Great Northern Railway Authorization for Expenditure (AFE) 27970, 1925.
- Item422418 - Great Northern Railway Authorization for Expenditure (AFE) 28203, 1925.
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