Books by Illinois Office of Education. Dept. of Budget and Statistics:
Books in the extended shelves:
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Illinois Office of Education. Dept. of Budget and Statistics: Fall pupil enrollment and teacher statistics, Illinois public schools ... school year (Illinois State Board of Education., in the 1970s), also by Illinois Office of Education. Dept. of Planning and Research and Illinois. Office of the Superintendent of Public Instruction (page images at HathiTrust)
Find more by Illinois Office of Education. Dept. of Budget and Statistics at your library, or elsewhere.