1939-1945 20thcentury diaries dimitrovgrad history historyроссийскаянациональнаябиблиотека librarians libraries rossiĭskai͡anat͡sionalʹnai͡abiblioteka russia(federation) saintpetersburg siegeofsaintpetersburg(russia:1941-1944) sources worldwar worldwar(1939-1945)