Scientific DataHistorical state-level data on U.S. public school systems from 1919/20 to 1973/74Katrina M. WalsemannEmily AbbruzziHeide M. JacksonPallavi TyagiJennifer A. Ailshire2025-07-14Full textDOI https://doi.org/10.1038/s41597-025-05507-6