Description based on surrogate for: 1987., Compiled by: Bertha S. Waters, 1986-1989; Bertha S. Waters and Kathleen R. Kennedy, 1990-, Some vols. accompanied by poster., and Latest issue consulted: 1990.
Observed in Mar. each year.
Issued by: Commonwealth of Pennsylvania, Dept. of Education, Bureau of Educational Planning and Testing, Division of School Equity.