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1. A B C's of Science
2. A Critical Examination
3. A History of Aeronautics
4. A History of Science Volume 1
5. A History of Science Volume 2
6. A History of Science Volume 3
7. A History of Science Volume 4
8. A Naturalist's Voyage Round the World
9. A Preliminary Revision of the North American Species of Cactus, Anhalonium, and Lophophora
10. An Introduction to Chemical Science
11. Animal Heroes
12. Coral Reefs
13. Criticisms On "The Origin Of Species"
14. Darwin And Modern Science
15. Discourse on the Method of Rightly Conducting the Reason and Seeking Truth in the Sciences
16. Dry-FarmingA System Of Agriculture For Countries Under Low Rainfall
17. Evidence As To Man's Place In Nature
18. Evolution and Ethics and Other Essays
19. Forest Ecology
20. Geological Contemporaneity and Persistent Types of Life
21. Geological Observations on South America
22. Great Astronomers
23. Introductory Astronomy: Study Guide
24. Lectures on Evolution
25. More Letters Of Charles Darwin 1
26. More Letters Of Charles Darwin 2
27. On Some Fossil Remains of Man
28. On the Advisableness of Improving Natural Knowledge
29. On the Origin of Species
30. On the Reactions of Man to the Lower Animals
31. On the Significance of Science and Art
32. On the Study of Zoology
33. The Autobiography of Charles Darwin
34. The Coral Island: A Tale of the Pacific Ocean
35. The Cruise Of The "Cachalot"Round The World After Sperm Whales
36. The Darwinian Hypothesis
37. The Descent Of Man And Selection In Relation To Sex
38. The Development of the Brain in Man and Apes
39. The Different Forms Of Flowers On Plants Of The Same Species
40. The Effects Of Cross And Self-Fertilisation In The Vegetable Kingdom
41. The Expression of Emotions in Man and Animals
42. The Ethics
43. The Euahlayi TribeA Study of Aboriginal Life in Australia
44. The Evolution of Modern Medicine
45. The Formation of Vegetable Mould
46. The Interpreters of Genesis and the Interpreters of Nature
47. The Malay Archipelago 1
48. The Malay Archipelago 2
49. The Naturalist on the River Amazons
50. The Origination of Living Beings
51. The Origin and Nature of the Emotions
52. The Origin of Species
53. The Rise and Progress of Paleontology
54. The Variation Of Animals And Plants Under Domestication Part 1
55. The Variation Of Animals And Plants Under Domestication Part 2