De Bock, D. 2025. Modern Mathematics/New Math: From Its Heights in the 1960s to Its Fall in the Early 1970s. Annales Universitatis Paedagogicae Cracoviensis | Studia ad Didacticam Mathematicae Pertinentia. 17, (Dec. 2025), 5–24. DOI:https://doi.org/10.24917/20809751.17.1.