I'm not sure if newspapers/documents are treated the same way as ebooks & mp3s in the Amazon media library? You can select multiple items from that page, move them to the trash, and then delete them from the trash. However it doesn't work for ebooks, as it won't let you delete them from the trash in case you want to re-download them from Amazon, but it might let you do it with documents.
You can try it yourself at:
Media library -
https://www.amazon.com/gp/ays?