Mae Knight Clark & Laura Cushman, illustrated by Marion Henderson & Doris Henderson.
Numbers at work, revised; teacher's ed. (Self-help number series)
R647841. Numbers at work, revised; teacher's ed. By Mae Knight Clark & Laura Cushman, illustrated by Marion Henderson & Doris Henderson. (Self-help number series) NM: additions. © 7Nov49; AA133193. Mae Knight Clark & Laura Cushman (A); 2Dec76; R647841.
Mae Knight Clark & Laura Cushman|A