Terms for subject Historical containing 20/20

English	Russian
as early as in the beginning of the 20th century	ещё в начале XX века (Soulbringer)
at the outset of the 20th century	в начале XX века (Alex_Odeychuk)
at the 20th Party Congress	на XX съезде партии (cnn.com Alex_Odeychuk)
cognisant of 20th-century European history	знакомый с историей Европы XX века (theguardian.com Alex_Odeychuk)
in the first half of the 20th century	в первой половине XX века (Alex_Odeychuk)
in the second half of the 20th century	во второй половине XX века (Alex_Odeychuk)
in the 20th century	в XX веке (Alex_Odeychuk)
new version of the 20th Party Congress	ХХ съезд партии на новый лад (a reference to the 1957 speech given by the Soviet leader Nikita Khrushchev denouncing Stalin's cult of personality, which sent shock waves across the Soviet Union theguardian.com Alex_Odeychuk)
political reprisals of the 20th century	политические репрессии XX века (theguardian.com Alex_Odeychuk)
20th-century European history	история Европы XX века (theguardian.com Alex_Odeychuk)
until the early 20th century	до первых десятилетий ХХ века (Alex_Odeychuk)