Subtraction Snake Game in 4 boxes Mary Sheridan's From Birth to Five Years Heredity and Creation

Heredity and Creation

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Subtraction Snake Game in 4 boxes Mary Sheridan's From Birth to Five Years Heredity and CreationThis set contains four boxes that include 23 Golden Bead Bars of ten, five sets of Coloured Bead Stairs, one set of black and white Bead Stairs and five sets of negative Bead Stairs. The child is introduced to subtraction combinations.