1. Kansas-Nebraska map, 1855 Maps University Of Nebraska Lincoln Public content 1989. UNL Libraries Image & Multimedia Collections.
2. Map of Morrill Expeditions to 1901 Maps University Of Nebraska Lincoln Public content 1989. UNL Libraries Image & Multimedia Collections.
3. The Villasur Expedition Maps University Of Nebraska Lincoln Public content 1720. UNL Libraries Image & Multimedia Collections.