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2. : The effects of science instruction on children's acquisition of ability to perform formal operational tasks concerning volume relationships. (Doctoral dissertation, University of Texas, 1969.) Dissertation Abstracts International, 1970, 31 (University Microfilm No. 70-10, 813).
3. The effect of instruction on the acquisition of conservation of volume
4. : Psychological Statistics. New York: John Wiley & Sons, 1962.