Use the Congress number with its suffix

Error²Federal courts, Illinois courts21st and 22nd editions

The number of a Congress or a legislative body is written as a numeral with its suffix, “105th Cong.” or “83d Cong.”; a body named by year instead, “1999 Gen. Assemb.”, takes none.¹

1. 1R. 13.2(a) Unenacted federal bills and resolutions; R. 6.2(b)(i) Ordinals; R. 6.2(b)(ii) Ordinals; B13 Legislative Materials. Tables: R. 13.1 Basic Citation Forms.
2. 2An error: the rule in note 1 allows one form, and this is not it.