*Some background*:

I've stumbled on a few so to say "dead" articles. Articles that have great content but the website where they are published is "gone". Thanks to the Internet Archive we can get the content but search engines aren't indexing them so you can't get there via searching. 

*The question*

Can I publish the content from those blogs let's say in Medium (given that I can't contact the author to ask for permission)?

Edit: I want to give full credit to the original authors.