He also printed a number of multilingual works ( Latin , Polish , and German ) .
Most of these prints were in Latin , but Vietor was also the first printer to print regularly in Polish , which accounts for 10 - 15 % of his output .
Vietor also printed a number of multilingual works ( Latin , Polish , and German ) .
Most of these prints were in Latin , but Vietor was also the first printer to print regularly in Polish , which accounts for 10 - 15 % of his output .