References to the Illinois Register contain the volume number and the page number, which is continuously numbered over the course of a volume. For example, 42 Ill. Reg. 10808 refers to page 10808 of the 42nd volume. The Illinois Register's includes references to page numbers to make it easier to find the correct issue, which in this example would be the 22 June 2018 issue.
All issues of the Illinois Register since the 16August 2002 issue are available on the Secretary of State's website. Issues before that are available sporadically online via Google Books or the InternetArchive. For help in finding a particular issue, check with the Reference Desk at the or the .