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Piaget. Ginsburg,Herbert and Opper,Sylvia. Piaget's theory of intellectual development. An introduction. Englewood Cliffs,N. J.: Prentice-Hall, 1969, 237 p., $2.95 (paper), $6.95 (cloth). Phillips,John L., Jr. The origins of intellect. Piaget's theory. San Francisco: W. H. Freeman and Company, 1969, 149 p., $2.75 (paper) |
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