Congressional Committee Hearings (HSSE Documents Y 4 and various breakdowns e.g. Y 4.AR 5/3 for Senate Armed Services Committee hearings. These are great information sources because congresional committees have the legal authority to swear in witnesses, feature information from a variety of sources and viewpoints, document committee members questioninf of witnesses and witness responses, and because congressional committees are responsible for approving legislation, funding government programs, and conducting oversight of these programs. Hearing transcripts may include reports submitted by committee members and witnesses.) Visit here for access to additional congressional committee publications from the 1970s.
Congressional Record HSSE Repository X/A (Request at HSSE Circulation Desk) and online through Digital U.S. Congressional Serial Set.
Contains the text of congressional debate, recorded votes, legislation and other helpful information.