S. I. Kovlekov

• Socialistic competition in Yakutia (1959-1988 )
• History of Yakut agriculture (1946-1970)
• History of Yakut agriculture (1971-1985)
• Kulʹturnoe stroitelʹstvo v Sovetskoĭ I︠A︡kutii
• Profsoyuzy sovetskoi Yakutii, 1917-1937 gg
• Socialist competition in Yakutia (1935-1958)
• Sot͡sialisticheskoe sorevnovanie v I͡Akutii, 1959-1988 gg
• Tungus Rebellion 1924-1925
• Tungus Rebellium 1924-1925
• V.V. Nikiforov i sʺezd i͡akutov 1912 goda
• Yakut congress in 1912 and V.V. Nikiforov