TY JOUR TI ACTUAL DIRECTIONS OF RESEARCH HISTORIES OF BLOKADE LENINGRAD TAKING INTOACCOUNT NEW SOURCE BASE KW blockade of Leningrad KW new documents KW historiography. JO Modern Technologies and Scientific and Technological Progress AU Savchuk, N.V. AU Tokareva, T.S. PY 2020 IS 2020 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»