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- catalog contributor b4350579.
- catalog created "1966.".
- catalog date "1966".
- catalog date "1966.".
- catalog dateCopyrighted "1966.".
- catalog description "Bibliography: p. [45]-46.".
- catalog extent "46 p.".
- catalog isPartOf "Monographs of the Society for Research in Child Development ; v. 31, no. 6, serial no. 108.".
- catalog issued "1966".
- catalog issued "1966.".
- catalog language "eng".
- catalog publisher "[Chicago, Published by the University of Chicago Press for the Society for Research in Child Development]".
- catalog subject "153.2/3".
- catalog subject "LB1103 .S6 vol. 31, no. 6".
- catalog subject "Number concept.".
- catalog title "The development of conservation and differentiation of number.".
- catalog type "text".