The Mapping History project began in 2015, and is still ongoing as students and faculty from the University Archives, the School of Architecture, the Scholarly Commons at the University Library, and various other departments work to piece together a history of the University told through maps, photos, and historical documents. You can explore the project through their website; be sure to check out this animated map timeline of the growth of the university and the many interactive maps that allow you to dig deeper into UIUC history.
Above image a portion of map obtained from the University Library Digital Collections. You can see the full image here.