Legislative history relates to how a bill becomes law, and includes the documents and steps involved in passage. Legislative intent relates to why a bill becomes law, and who proposes ideas or reforms. The primary documents of legislative history can often illustrate legislative intent.
Committee hearings and audio tapes
Interim committee reports
bill author, sponsor in the legislature (a legislator's own words would carry the most weight as to intent)
supporters, opposition, witnesses
individuals, committees, or organizations that proposed ideas or reforms