Piaget, Jean, 1896-1980 The child's conception of the world / Jean Piaget; translated by Joan and Andrew Tomlinson. - London : Routledge & Kegan Paul , 1929, repr. 1951. - ix, 397 p. : ill. ; 23 cm. Half-title: International library of psychology and scientific metho d. Subjects--Topical Terms: Child study. Dewey Class. No.: 155.4