Introduction : Challenging Norms : Family Planning as a Reflection of Social Change in Twentieth-Century Eastern Europe : Introductory Remarks - Hein-Kircher, Heidi; Hiemer, Elisa-Maria (. Challenging norms. - New York : Berghahn Books, 2025. - ix, 378 Seiten. - Illustrationen. - ISBN 978-1-80539-964-3, 2025)