Lovell, Kenneth.
The growth of basic mathematical and scientific concepts in children, by K. Lovell; foreword by Bärbel Inhelder. - New York, Philosophical Library [1962, c1961] - 154 p. illus. 23 cm.
Includes bibliographies.
62052976
Number concept in children.
Conservation (Psychology)
QA135 / .L815
136.7 / LOG
The growth of basic mathematical and scientific concepts in children, by K. Lovell; foreword by Bärbel Inhelder. - New York, Philosophical Library [1962, c1961] - 154 p. illus. 23 cm.
Includes bibliographies.
62052976
Number concept in children.
Conservation (Psychology)
QA135 / .L815
136.7 / LOG