Started Out Good and Then Got Stupid
The first seasons - the black and white shows - were great as they were historical and interesting: stories about genuine settlers including the first mailman, the first female telegraph operator, etc. Later, however, when the series went colorized and moved into the mid-sixties the show was a joke as most of the episodes were far-fetched (a lá "Lost in Space"), and even comedic. For viewers, stay away from the shows that were filmed after about 1962:
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