Particularly, the materials housed in the Imperial Library comprise a collection of great value, including pre-war Japanese books, rare old books and Western books, which were acquired comprehensively based on the Legal Deposit System under the Publishing Act.
特に帝国図書館の蔵書は出版法の納本制度に基づいて網羅的に収集された戦前の和図書や、貴重な古書、洋書などを含み、きわめて価値が高い。