Mental maps of Shtetls In the absence of professionally-made maps, groups of survivors made new maps of their destroyed communities for their memorial books, known as 'Jizker-bicher.' These 'mental maps' didn't adhere to topographical standards; rather, they served as testimonials to the world they had lost. For instance, in Yanova, where 80% of its 4,000-strong population was Jewish before the war.
