[1] It was originally produced from 1973 until 1978, and was narrated by William Conrad.
[2][3][4] The soundtrack was composed by Gerhard Trede, Beatrice Witkin, and Richard Peaslee.
Reruns were later aired by PBS, the USA Network, and Australia's ABC during the 1980s.
HBO currently offers clips of the series to commercial customers.
This article relating to a non-fiction television series in the United States is a stub.