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2. A Digest of Investigations in the Teaching of Science in the Elementary and Secondary Schools, P. Blakiston's Son & Co., Philadelphia, 1926.
3. Second Digest of Investigations in the Teaching of Science, P. Blakiston's Son & Co., Philadelphia, 1931.
4. Third Digest of Investigations in the Teaching of Science, Philadelphia, P. Blakiston's Son & Co., 1931.