Four great compilations of Northern Song dynasty, namely: Extensive records of the Taiping era (978) [[太平廣記|太平广记]], Imperial readings of the Taiping era [[太平御覽|太平御览]], Prime tortoise of the record bureau [[冊府元龜|册府元龟]], Finest blossoms in the garden of literature [[文苑英華|文苑英华]]