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The Great Northern Railway- Blueprint-Authorization for Expenditure Collection (GN_Blueprint_AFEs) was created by the Great Northern Railway Historical Society from materials at the Jackson Street Roundhouse. Blueprints and other documents stored with Great Northern Railway Authorization for Expenditure files were gathered and cataloged as a separate collection with reference to the Authorization for Expenditure number where available. In addition to Great Northern Railway blueprints, some supplier blueprints, catalogs, and other supplemental materials for individual projects are included. Blueprints are categorized as Engineering drawings when depicting buildings, track and other structures and as Mechanical drawings when applicable to rolling stock. Other (minor) categories of documents include maps and plats, photographs and printed ephemera.