Updated to include 1926 volumes. Also 1926 volumes of Atlantic monthly, Blackwood, and Strand.

PD-old should be PD-old-expired|country=US for the US magazines, I think.

Also the years are off by one somehow at least around volume 32.

Also the non-US 1926 works cannot go to Commons, they should use to_ws and the associated parameters.

I think I fixed all the issues. I choose 2126 as the safe date to move the files to Commons because I assume that everyone who wrote in 1926 would have been dead + 70 by then.

I think 2126 is a little bit on the cautious side. Commons sets 150 years (i.e. 1871 right now) as their cut-off for collective works without needing to actually check (https://commons.wikimedia.org/wiki/Commons:Collective_work). I.e. they assume the chances that someone live 80 years after writing is low enough to be an acceptable risk. So that would be 1926 + 150 + 1 = 2077.

Also, it can be lowered by 30 years with the research to check all the authors. Which actually would not be so hard "one day" if every article has a Wikidata item with author properties.

Good to know. I'll make use this formula in the future. Sheet updated.