Over the past twenty years, for instance, it has built up an online database of the victims of political repression in the USSR. Its fifth version contained over three million names and yet it was estimated that 75% of the victims had not yet been identified and recorded. This resource was created by entering information accumulated all over Russia since the late 1980s in Books of Remembrance, short biographical entries of those sent to the Gulag or shot during the Great Terror (1937-1938).