Here are some helpful links for tracking down rules, regulations, and other legal information pertaining to the National Park Service and National Park System.
2006 National Park Service Management Policies
Director's Orders And Related Documents
36 CFR Chapter I - NATIONAL PARK SERVICE, DEPARTMENT OF THE INTERIOR
USC : Title 18 - CRIMES AND CRIMINAL PROCEDURE
USC : Title 21 - FOOD AND DRUGS
And here's a link directly to Traveler's own library, where you can find documents, be they legal rulings, hiking trail information, scientific reports, whatever.
