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2. Second Digest of Investigations in the Teaching of Science, pp. 75–79.
3. Second Digest of Investigations in the Teaching of Science. Philadelphia: P. Blakiston's Sons and Co., 1931.
4. National Society for the Study of Education. Thirty-First Yearbook, Part I: A Program for Teaching Science. Bloomington, Ill.: The Public School Publishing Co., 1932.
5. Ohio Universi;Orata,1928