 Because numerous residents emigrated from Moscow after the Russian Revolution of 1917 and tens of thousands more were either arrested, shot, or sent to the gulag by the Cheka and the NKVD after 1918 the section detailing residents names is especially useful in determining until when a certain person was still living in the city, and under which address.Many original directories in the series (or microfiche copies thereof) can be found in libraries across the United States, Europe (including The Baltics, Finland the United Kingdom and Germany) however most only have an incomplete collection.Suvorin also published city directories for Saint Petersburg under the title "Ves Petersburg" ("All Petersburg") for the years 1894 to 1940 and for the whole country under the titles "Vsya Rossiya" ("All Russia") from 1895 to 1923 and continued under than name "Ves SSSR" ("All USSR") from 1924 to 1931.