Great Northern Railway Historical Society Blueprint Collection JSBP1635, Fridley, Minnesota, 1941. Crossing Frog - Number 2. Site Plan and Plan. Interstate Commerce Commission Account Number 9, Rails. Other ICC account descriptions: ICC Account Number 9, Crossing Frog.

Great Northern Railway Historical Society Blueprint Collection JSBP4200, Proctor, Minnesota, 1905. Duluth, Missabe & Northern Railway Blueprint Number #6050 Sheet 4, Machine Shops. Floor Plan and Sections. Interstate Commerce Commission Account Number 20, Shops and Engine Houses. Other ICC account descriptions: ICC Account Number 20, Shop Facilities.

Great Northern Railway Historical Society Blueprint Collection JSBP4283, Sandstone, Minnesota, 1895. Eastern Railway of Minnesota Blueprint, Engine House. Elevation. Interstate Commerce Commission Account Number 20, Shops and Engine Houses. Other ICC account descriptions: ICC Account Number 20, Shop Facilities.