Modern public libraries are developing very rapidly. Almost all western countries have enacted library laws to ensure the development of public libraries. The state guarantees the source of funds for public libraries with administrative funds or taxes. The library law of Scandinavian countries stipulates that the government must support public libraries financially and organizationally; Public libraries should have unified leadership and division of labor, and then establish a public library network. In the second year after Czechoslovakia's independence (19 19), the advanced public library law was promulgated. According to the law, all towns and settlements with a population of more than 300 people must establish public libraries, and local governments will guarantee their funds. In America, public libraries are considered as "people's universities". Librarians in public libraries try their best to serve readers. The openness of the library is a prominent feature of public library work, and open-shelf lending is widely used. In order to provide services for readers in remote areas, automobile libraries have appeared, and in some countries in northern Europe, book boats and book boats have also appeared (see mobile library service). The service targets have even expanded to hospital wards and prisons. Because Lenin particularly emphasized the role of public libraries, public libraries increased rapidly after the October Revolution in the Soviet Union.