Title: Sefer Teshuvat Riva
Subjects: Responsa, Rabbis, Biography
Places: Austria, Rechnitz, Slovakia, Čachtice, Hungary, Paks
People: Joseph ben Ephraim Karo (1488-1575), Baruch Epstein ha-Levi (1860-1942), Joel Ungar of Rechnitz (-1885)
Time periods: 1800-1948