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10. Bee City. © 9Jul50 in notice: 1951); MP4081.

11. Bird Control. © 2Jan51; MP4080.

12. Bird Island. © 21Jun50 in notice: 1949); MP4076.

14. Can Animals Think? © 21Oct50 in notice: 1949); MP4430.

18. Constructive Chemistry. © 28Dec50 in notice: 1951); MP4072.

22. Dragons and Damsels. © 28Jun50 in notice: 1951); MP4078.

24. The Earth’s Skin. © 7Feb51; MP4079.

26. Eyes Under Water. © 12Jul50 in notice: 1949); MP4425.

28. Giant Beetles. © 7Sep51 in notice: 1949); MP4765.

29. Glass. © 13Sep53 in notice: 1949); MP4426.

30. Green Vagabonds. © 21Dec50 in notice: 1949); MP4428.

31. Harpsichord. © 26Nov50 in notice: 1949); MP4074.

35. The Infinite Universe. © 3Dec50 in notice: 1949); MP4432.

36. Land of Microbes. © 3Dec50; MP4436.

37. Liquid Air. © 4Jun50 in notice: 1949); MP4435.

38. Miracle of Life. © 25Jun50 in notice: 1951); MP4073.

4. Ant City. © 13Jul50 in notice: 1949); MP4433.

41. Mr. and Mrs. Canary. © 17Sep51; MP4437.

44. Nature’s Techniques. © 24Sep51 in notice: 1949); MP4766.

47. Pencil Points. © 2Aug50 in notice: 1949); MP4427.

49. Power of Plants. © 6Aug50 in notice: 1949); MP4442.

52. Robbers Under Water. © 31May50 in notice: 1949); MP4429.

54. Sails in the Wind. © 13Dec50 in notice: 1949); MP4763.

57. Sea Zoo. © 17May50 in notice: 1949); MP4440.

58. Sensitivity of Plants. © 14May50; MP4438.

6. Autumn. © 10Dec50; MP4439.

62. Steel. © 5Jul50 in notice: 1949); MP4075.

65. Sun, Earth, and Moon. © 3Dec50 in notice: 1949); MP4441.

67. Training of the Young. © 10May50 in notice: 1949); MP4764.

79. Father Knows Best. © 1Dec51 in notice: 1949); MP4434.

8. Beauties on the Beach. © 13Sep51 in notice: 1949); MP4424.

81. Ferns. © 7Dec50 in notice: 1949); MP4761.

83. The First Architects. © 19Sep51 in notice: 1949); MP4431.

92. Miracle of Moss. © 9Aug50 in notice: 1951); MP4077.