Robert Lee Morton, Merle Gray, Elizabeth Springstun & William I. Schaaf.
Making sure of arithmetic; outline for teachers' guide. Grades 1 & 2.
R596917. Making sure of arithmetic; outline for teachers' guide. Grades 1 & 2. By Robert Lee Morton, Merle Gray, Elizabeth Springstun & William I. Schaaf. © 21Mar47; AA47802. Robert Lee Morton & Merle Gray (A); 22Jan75; R596917.
Robert Lee Morton & Merle Gray|A