Second hand books I've bought

Of all the second hand gardening books you’ve brought, which have you found most useful ?

I'm not a fan of No Dig Charles either. All his books have the same information, jiggled about and regurgitated.                                                                                .

I haven't watched or read any of Charles' content since I found him in a video endorsing all sorts of quackery. https://www.youtube.com/watch?v=5_HWRXm1jFg