CALENDAR: Julian/Gregorian (1878-1916); Gregorian (from 1916); MAIN RECORD: languages used: Bulgarian (from 1878), Russian (1878-1879); scripts: Bulgarian - original, Russian - original; TRANSLITERATION (in parentheses): Bulgarian - "The World's Writing Systems", ed. by Peter T. Daniels & William Bright (New York, 1996), Russian - GOST-1983; OTHER: English equivalents (glossary)