Mae Knight Clark & Laura Cushman.
In number land; revised teacher's edition. (Self-help number series)
R645666. In number land; revised teacher's edition. By Mae Knight Clark & Laura Cushman. (Self-help number series) NM: additional material. © 11Oct49; AA130069. Mae Knight Clack & Laura Cushman (A); 5Nov76; R645666.
Mae Knight Clack & Laura Cushman|A