Great Northern Blueprint Number 1251-33-1, map of Plat Showing Land Required for Flint Gravel Pit, undated. Other subject categories: Right of Way and Track Map

Great Northern Blueprint Number 1251-33-7, map of Flint Gravel Pit, undated. Other subject categories: Right of Way and Track Map

Great Northern Blueprint Number 1251-33-11, map of Flint Pit, 1904. Other subject categories: Right of Way and Track Map

Great Northern Blueprint Number 1251-33-9, map of Flint Pit, 1902. Other subject categories: Right of Way and Track Map

Great Northern Blueprint Number 1251-33-10, chart of Flint Gravel Pit Test Pits, undated. Other subject categories: Chart