The Making Of A Natural History Film (S1E1)
3/3/1974
Where Did the Colorado Go? (S1E2)
3/10/1974
Whales, Dolphins, and Men (S1E3)
3/17/1974
The Search For Life (S1E4)
3/24/1974
Last of the Cuiva (S1E5)
3/31/1974
Strange Sleep (S1E6)
4/7/1974
The Crab Nebula (S1E7)
4/14/1974
Bird Brain: The Mystery of Bird Navigation (S1E8)
4/21/1974
Are You Doing This for Me, Doctor? (S1E9)
4/28/1974
The First Signs Of Washoe (S1E10)
5/5/1974
The Case of the Midwife Toad (S1E11)
5/12/1974
Fusion: The Energy of Promise (S1E12)
5/19/1974
The Mystery Of The Anasazi (S1E13)
5/26/1974
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