References

References
HURD, P. D., and J. J. GALLAGHER. 1968. New directions in elementary education. Wadsworth Publishing Co., Bel- mont, Calif.
Hurd
New directions in elementary education
1968
KARPLUS, R., and H. D. THIER. 1967. A new look at elementary school science. Rand McNally & Co., Chicago.
Karplus
A new look at elementary school science
1967
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