This collection contains images of maps charting the last 400 years of historical development in Illinois and the Northwest Territory. Designed to appeal both to map aficionados and to educational institutions, the project aims to provide a broad spectrum of content, from expert scholarship of mapmakers and mapmaking to general knowledge about cartography and history. In addition, the database includes historic topographic maps of Illinois. The collection contains early large-scale topographic quadrangles published by the United States Geological Survey in the late nineteenth and early twentieth centuries. Maps covering each part of the State of Illinois are included.