Belarus Gazetteers
Belarus was created from five imperial provinces: Minsk, Vilno, Vitebsk, Mogilev, Grodno.
Gazetteers were published for all of these except Grodno:
Minsk. Yarmolovich, V. S. Spisok naselennykh mest Minskoi gubernii [Populated places in Minsk Province]. Minsk, 1909. (Film 1,923,576 item 1)
Mogilev. Pozharov, G. P. Spisok naselennykh mest Mogilevskoi gubernii [Populated places in Mogilev Province]. Mogilev, 1910. (Film 1,923,576 item 2)
Vitebsk. Spisok naselennykh mest Vitebskoi gubernii [Populated places in Vitebsk Province]. Vitebsk, 1906. (Film 1,923,576 item 3)
Vilno. Spisok volostei i sel'skikh obshchestv po mirovym uchastkom Vilenskoi gubernii [List of volosts & towns by court district, Vilnius Prov.]. Vilnius, 1873. (Film 2,268,932 item 3)
Administrativno-territorial'noe ustroistvo B.S.S.R. (2 Vol.) FHL INTL Reference book 947.8 Ea.
Tsentral'noe Statisticheskoe Biuro B.S.S.R. Spisok naselennykh miest B.S.S.R. (b. Minskoi gubernii). FHL INTL film 2044163, item 1.
Available Online
The Geographical Dictionary of the Kingdom of Poland and Other Slavonic Countries (in Polish) Słownik Geograficzny Królestwa Polskiego i Innych Krajów Słowiańskich is available by book, microfilm, CD and now online, it is very useful resource for the period 1864-1918. The Slownik includes descriptions of villages,towns and cities in what is now Belarus and Lithuania as well as Poland.
A searchable version is available at Domena Internetowych Repozytoriów Wiedzy
More information about how to access and use the Słownik is available from Steve's Genealogy Blog