Issues of children's health ecology in Karaganda region (mid-1940s) Valeria Kozina, Zhanara Abdukarimova, Gulnar Baigozhina, Zauresh Saktaganova, Zhanna Mazhitova and Dina Kurbanova E3S Web of Conf., 389 (2023) 02020 Published online: 31 May 2023 DOI: 10.1051/e3sconf/202338902020