Great Northern Technical Drawing 1219-31-1, Crossing Frogs Illinois Central & Union Terminal (Superceded), 1906. Other subject categories: Drawing

Great Northern Blueprint Number 1240-34-1, Great Northern Crossing Frogs Illinois Central & Union Terminal, 1906. Other subject categories: Drawing

Great Northern Technical Drawing 1219-31-4, Crossing Frogs Illinois Central & Union Terminal (Removed 1919), 1919. Other subject categories: Drawing

Great Northern Technical Drawing 1219-31-2, Crossing Frogs Illinois Central & Union Terminal (Removed 1919), 1919. Other subject categories: Drawing

Great Northern Technical Drawing 1219-31-5, Crossing Frogs Illinois Central & Union Terminal (Void), undated. Other subject categories: Drawing

Great Northern Technical Drawing 1219-31-8, Crossing Frogs Illinois Central & Union Terminal, undated. Other subject categories: Drawing

Great Northern Technical Drawing 1219-31, Crossing Union Terminal (2 copies), undated. Other subject categories: Drawing

Great Northern Blueprint Number 1240-34-5, Great Northern Sioux City Crossing, undated. Other subject categories: Drawing

Great Northern Blueprint Number 1240-34-6, Great Northern Sioux City Crossing, undated. Other subject categories: Drawing

Great Northern Technical Drawing 1219-31-3, Crossing Frogs Illinois Central & Union Terminal (Superceded), undated. Other subject categories: Drawing