Keywords: Catechism by Petkevicius (1598).jpg Title page of the bilingual Polish Lithuanian catechism by Merkelis Petkevičius published in Vilnius in 1598 http //www mab lt/lt/archyvas/21/petkevicius 1598 Merkelis Petkevičius PD 1598 books Catechisms Grand Duchy of Lithuania PD-old-100 |