Add the years the issue collects

Error²Federal courts, Illinois courts21st and 22nd editions

An issue of the Official Journal's Special Edition gathers acts from a stretch of years rather than one, so a span of years stands in front of the reporter where a volume number would otherwise sit.¹

1. 1R. 21.9(a)(i) Sources.
2. 2An error: the rule in note 1 allows one form, and this is not it.