According to the Academic Hall, there are many keywords in historical papers, such as history, historical theory, historical thoughts, North America, the United States of America, Liao, Song, Jin and Yuan Dynasties, historical research, ideological system, social sciences, Song Dynasty, Marxism, history, historical materialism, publishing houses, Marxist philosophy, historical materialism, cultural institutions, historical philosophy, the United Kingdom of Great Britain and Northern Ireland, Marx and so on.