I was able to record episodes 3,4, 5 and 6 of "The American Revolution" on PBS stations in my bedroom Digital tv recorder(DVR)

I tried on my Tivo but I couldn't find what I was looking for. I like to record in HD whatever I record so there are cable channels that aren't HD and there are those that are HD. But, somehow not using a Tivo in the bedroom I was more successful. Part of the reason I think is that there are two PBS stations right together next to each other channel wise so I could cruise looking at both channels for days to find the ones I wanted to record. 

Otherwise you might have to pay $6.99 for each of the 6 episodes within a month or two to watch them or do something else.