I have downloaded several books from this site before. To see which books you can download you should specify Full View in the Advanced Search option. I believe these are all downloadable.

I think the Limited Preview option gets you books you can read online but not download. Others are not downloadable, though some have selections you can view.

You should be able to see which of Jim's list is downloadable - there should be a Download PDF button on the page the link takes you to; if it's not there it's not downloadable.

Mick