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Books about Gurska:
The Berke family: From Wilhelmius and Maria (von Gurska) Berke circa 1800 in the Posen, Poland, and Obernik, Germany... by Bernard Stanford Berke (1995)
Wiki information Gurska:
Albertas Gurskas is a Lithuanian calligrapher, graphic artist, and professor, founder of the Lithuanian School of Calligraphy. He is a notable designer of coins in Lithuania.