NAEP 1992 trends in academic progress : achievement of U.S. students in science, 1969 to 1992 - mathematics, 1973 to 1992 - reading, 1971 to 1992 - writing, 1984 to 1992 / Ina V.S. Mullis ... [et al.] ; prepared by Educational Testing Service under contract with the National Center for Education Statistics, Office of Educational Research and Improvement, U.S. Department of Education