John Logan Allen

A foundational study of the geographical imagination that shaped the Lewis and Clark Expedition, examining how pre-expedition assumptions about western geography influenced the journey's planning and execution.

A comprehensive survey of the cartographic history of western North America as it relates to the Lewis and Clark Expedition, from early European maps through Clark's master map.

An analysis of William Clark's cartographic skills and contributions, examining his field maps, celestial observations, and the great master map he produced after the expedition.