There are approximately 310,000 items in the Grand Secretariat Archives at the Institute of History and Philology. These include imperial decrees, edicts, memorials, tribute documents, examination questions, examination papers, rosters of successful examination candidates, documents from the offices of the Grand Secretariat, documents from the offices for book compilation, and old documents from Mukden. Memorials make up the bulk of these documents. The archives contain valuable source materials for institutional, social and economic historians. They record general administrative activities and legal cases, many of which cannot be found in Ch'ing legal compendia.