This collection contains microfilm copies of field notes and township plats from the original federal survey of Illinois townships. The field notes (59 reels) describe the natural and artificial boundaries of each Illinois township. The plat maps (7 reels) depict each township and its markings. An index to the field notes and plat maps is also included in the collection. There is also a group of contracts made with surveyors (1 reel).
The originals of these records are located in the Illinois State Archives, as indicated in the attached inventory. The Library purchased the microfilm in 1973.