"This report provides an overview of federal legislative history research, the legislative process, and where to find congressional documents. The report also summarizes some of the reasons researchers are interested in legislative history, briefly describes the actions a piece of legislation might undergo during the legislative process, and provides a list of easily accessible print and electronic resources. This report will be updated as needed."
CRS Report for Congress, R41865
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html