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1
01 - Bacteria, Part 1
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2
02 - Bacteria, Part 2
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3
03 - Bacteria, Part 3
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4
04 - Bacteria, Part 4
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5
05 - The Making of the Earth and the Story of the Rocks, Part 1
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6
06 - The Making of the Earth and the Story of the Rocks, Part 2
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7
07 - The Making of the Earth and the Story of the Rocks, Part 3
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8
08 - The Science of the Sea, Part 1
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9
09 - The Science of the Sea, Part 2
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10
10 - Electric and Luminous Organisms
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11
11 - Natural History V. The Lower Vertebrates
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12
12 - The Einstein Theory, Part 1
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13
13 - The Einstein Theory, Part 2
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14
14 - The Biology of the Seasons, Part 1
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15
15 - The Biology of the Seasons, Part 2
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16
16 - What Science Means for Man
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17
17 - Ethnology
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18
18 - The Story of Domesticated Animals, Part 1
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19
19 - The Story of Domesticated Animals, Part 2
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20
20 - The Science of Health, Part 1
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21
21 - The Science of Health, Part 2
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22
22 - The Science of Health, Part 3
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23
23 - Science and Modern Thought