Yes, that's why I pointed out that my hand-made URL gives you papers from all subject classes. I guess what's happened is this: originally they just had CS, th

Yes, that's why I pointed out that my hand-made URL gives you papers from all subject classes. I guess what's happened is this: originally they just had CS, then the number of submissions swelled and became impractically large, so they broke it up into subject classes... but they did not go back and sort all old submissions according to the newly introduced subject classes, because it would be way too much work. Maybe they will let somebody train a classifier on new submissions and let it go back over the old entries, someday. But until they do, the archive is an unsorted mess of all subject classes. And that's why they don't provide an archive link for each subject class.