Please recommend

Some PDF books on anarchism. It could be old, or something contemporary. But it has to be in PDF format only.

I was thinking http://www.prole.info/ would be perfect but their PDFs aren't specifically about anarchism...

You can get PDFs of all the texts on theanarchistlibrary.org by clicking the appropriate download link at the top of each, so just search for literally any keyword you might be interested in and see what comes up. You might also want to check this out. For example.

http://zabalazabooks.net/

LOTS of reading material there. only problem is most of it's arranged to print, so you have to skip around.