National Assessment of Educational Progress, 2012 Long-Term Trend
The National Assessment of Educational Progress, 2012 Long-Term Trend (NAEP 2012 LTT), is a study that is part of the National Assessment of Educational Progress (NAEP) program; program data is available since 1971 at https://nces.ed.gov/nationsreportcard/naepdata/. NAEP 2012 LTT …