Smithsonian Institution
National Museum of American History: The Congressional Hearings
Gives accounts, both written and audio, and photographs of the Senate Watergate hearings and the House Impeachment hearings.
Other
Watergate.info: Members of the Judiciary Committee
This Australian site from Watergate.info provides a list of the 38 members of the House of Representatives Judiciary Committee which met during 1974 and eventually voted to submit 3 articles of impeachment to the full House.
Curated OER
House Impeachment Hearings
Gives accounts, both writen and audio, and photographs of the Senate Watergate hearings and the House Impeachment hearings.