Descripción
Notas:"Pilot," <May 1993->
Edition statement varies: Pilot ed., 1982-19 ; Ed. 1, <May 1993->
Place of publication varies: Jefferson City, MO, <May 1993->
Also designated "1" to indicate grade level of material.
Accompanied by separately paged supplements called Teachers' edition.
Frecuencia de Publicación:Monthly during school year (Sept.-Oct., Jan.-May, bimonthly Nov./Dec.), Mar. 1989-