Government Documents = paper trail from all 3 branches of government; technically, every piece of paper the departments and agencies produce is a government document.
In reality, the Superintendent of Documents (SuDoc) decides what the Government Printing Office (GPO) will publish and disseminate through the Federal Depository System, which determines your access to it (i.e., availability online, via books here at Milne, or via Resource Sharing (IDS).)
Most current documents are disseminated online, and GPO is digitizing old documents, albeit at a slow rate.
Tracking State Environmental Legislation
Every state has a State Library, most of which have a web page with some information about getting state documents. Investigating a State Library’s web page can be challenging. Look for links that say Legislative Histories, or look for links to “Documents” or “Archives.” At the very least, you should be able to find a phone number to call and ask someone for help finding exactly what you are looking for.