A legislative history is a collection of materials that helps explain the meaning of a bill. This means that the first step is identifying relevant session laws.
Oregon Revised Statutes: Historical Notes
Each entry in the note is separated by a semicolon. The entries all cite to a chapter of the official publication of Oregon's session laws Oregon Laws.
If the first note is preceded by “Amended by” the section pre-dates the ORS and a more advanced examination of prior statutes is required. Repealed and moved ORS sections will retain their historical notes where the sections were previously located.