1994
Bavrin - Ancient Problems ru
    http://philipok4.narod.ru/Tuser7/Starinnye_zadachi.pdf
    5B54F838B95223E2A6EC0683D2B4908D
    72CA6ADC6B2A147B8DEB5A34130A4881
    4D12264D3EF85C42A2BA0061E7033E00
1978
VargaT - Math Vol 2 ru
1968
Bobrov - Magic TwoCorn ru
    http://ilib.mccme.ru/djvu/dvurog.htm
1967
Kotov - Entertaining Arithmetics Evenings ru
1963
Kolosov - Book for Out-of-class Math Reading ru
Litsman - Funny and Entertaining about Numbers and Figures ru
    9F9AEDD9F689506578B0645D1F9E966F
    7BB428FDAD2A83076DD8D770C33DE118
    6FFD885D537666DA457DEF5DAA0A220B
1962
Bobrov - Summer of Archimed vol2 ru
1961
Domoryad - Math Games and Entertainments ru
    https://vk.com/doc3260116_527699202?hash=a433370e8d6aa40af2
    6B3E53B6C2AE0CFD5B12530E84D6B5F5
    1FDCB3EF4E76D26546A402796A4C16BD
    1B81B8B6D5B6A89D86A26AF403037F38
    E1F6CA121CCB29CD2C0D1FD4E6D8A6DD
1959
Bobrov - Summer of Archimed vol1 ru
1953
Aleksandrov - Arithmetics Problems Solving Methods ru
1906
VeberVellshtejn - Enciclopedia of Elementary Algebra and Analysis vol1 ru