Issu holds a lot of rare pdf documents

If you use a generic online downloader it gives you a very low rest, downsampled version of the pdf, which is basically almost useless

I've done a lot of searching and I haven't figured out a way to download pdfs from there that are blocked from downloading.

Help?

Other than the internet archive obviously

I’m searching for old media, 90s popups, old magazines, weird posters, odd exploitation films, just generally anything that is almost being erased and is not commercially friendly. Where are good places to dig stuff up like that?