Overview
Planet Earth has supported life for some three billion years; but Man, characterized by his powers of thought and other other intelligent faculties, has shown greatest development.
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11 - 1"The Last Stand: Western Mountain Parks" November 02, 1970 -
11 - 2"The Last Stand: The Everglades of Florida" November 09, 1970
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11 - 3The Last Stand: Point Pelee November 16, 1970
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11 - 4The Last Stand: The Southwestern Desert November 23, 1970
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11 - 5A Sense Of Time: The Age Of The Universe December 07, 1970
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11 - 6A Sense Of Time: The Age Of The Earth December 14, 1970
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11 - 7A Sense Of Time: The Age Of Man December 21, 1970
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11 - 8The Great Lakes February 01, 1971
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11 - 9The Great Lakes February 08, 1971
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11 - 10Population Problems: Everybody'S Baby February 15, 1971
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11 - 11Population Problems: Tomorrow'S Child March 01, 1971
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11 - 12Who Help Themselves March 15, 1971
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11 - 13Psychiatry: Heavy Night March 22, 1971
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11 - 14Psychiatry: Street Fighting Mad March 29, 1971
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11 - 15Psychiatry: Human Potential April 05, 1971