House of Commons Papers include documents which result from the work of the House and its committees. The main categories of papers currently included are: i) Select Committee papers (their reports and evidence etc.) ii) minutes of proceedings of General Committees iii) returns to addresses by the House iv) estimates and appropriation, etc. accounts v) certain annual and other reports and/or accounts required by statute to be laid before the House vi) House returns.
Further information on this subject can be found from the following links.
Parliamentary Publications webpage
About Parliament: Parliamentary papers