Outstanding collection, thanks! (hurry to download (before it’s too late) 
)
For those of you who prefer to shoot first and ask questions later I recommend the DownThemAll! add-on for a FireFox (usage is straightforward, just type “/(.pdf)$/” without quotes in the “Fast Filtering” form entry):
https://addons.mozilla.org/en-US/firefox/addon/downthemall/
(you’ll download all the linked pdfs from above to the local hard drive, at once).