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Relations, number sentences and other topics. (English)
Mathematics learning in early childhood. 37. yearbook of the NCTM 1975. Editor(s): Payne, J.N. (Michigan Univ., Ann Arbor (USA)) National Council of Teachers of Mathematics, Reston, VA (USA) Reston, Va.: NCTM. 1976. p. 251-271 2. ed.
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