Teachers' manual of biology: a handbook to accompany the "Applied biology" and the "Introduction to biology" by Maurice A. Bigelow and Anna N. Bigelow;
Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb. "References relating to sex-instruction": p. 78-80. "Evolution and heredity" (books published since 1904): p. 94-95. "Appendix II. Biological books and pamphlets": p. 99-102
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