Add the series letter or the issue number

Error²Federal courts, Illinois courts21st and 22nd editions

Since 1968 the Official Journal has run parallel series that are paginated separately, so its parenthetical carries both the series letter and the issue number; earlier citations take the number alone.¹

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