Generally referred to as "submission for review", "delivery" and "storage", Article 23 of the Regulations on the Administration of Publishing, which came into effect in 2002, stipulates that "before publishing its publications, a publishing entity shall send samples to the National Library, China Map Library and the State Council Publishing Administration Department free of charge in accordance with relevant state regulations" (Note: publications mentioned in this Regulation refer to newspapers, periodicals, books, audio-visual products and electronic products. ), but there is no specified quantity; In recent years, some provinces and cities in China, such as Shanghai, Beijing, Hubei, Shenzhen, Zhejiang and other provinces and cities, have successively formulated and promulgated laws and regulations applicable to public libraries in their respective administrative areas. These local laws and regulations all contain provisions on the delivery of local documents and materials. For example, article 12 of the Regulations on Public Libraries in Hubei Province stipulates: "The provincial library is the collection unit of the published version of the province, and the municipal library is the collection unit of the local published version. Publishing houses, newspapers, magazines and other publishing units in the province shall submit two volumes (sets) of samples to the city and state libraries where the provincial libraries and publishing units are located within 30 days after publication. "