I note that things look a lot more "clean" then I would have expected. Notice the lack of trash in the towns and lack of junk in the open. Interesting.
It wasn't a throw away society, back then. If you bought flour, you brought a cloth bag with you to bring it home in. Almost nothing was 'disposable', back then.
If you bought a lot of goods, it might be packed in a wooden box, which would be used until it literally fell apart, and couldn't be repaired, and then burned as kindling.
Cardboard boxes weren't in common use until after the turn of the century.
Manufactured goods, including paper, were quite expensive, and most manufactured items had to hauled from the industrialized East.
The railroad were an enormous improvement over hauling freight in wagons, but it still cost money to haul goods 1000 miles to the Black Hills.
Also, having a photographer in town taking pictures of outdoor scenes was a BIG DEAL, and if there was any trash around, it got taken care of before the photograph(s) were taken, I'm sure.
Great set of images, OP. I just love old photographs, especially when there is an explanation for each one, telling me what I'm really looking at. Many thanks for the link.
One thing that has always struck me when I see old photographs of Native Americans, is how dark their skin was, compared to now.
I don't know how much was due to an outdoor lifestyle, but it is remarkable, compared to Native Americans today.