Great Northern Railway Historical Society Blueprint Collection JSBP2493, Hibbing, Minnesota, undated. Great Northern Blueprint Number 1088.01, Signal Layout. Interlocking Diagram. Authorization for Expenditure 11791. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Interlocking.
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LC Name Authority: https://lccn.loc.gov/n82080153