Is there any where there is a complete list of ars magica books for 1st thru 5th?
Used to be, on the FAQ: redcap.org/FAQ/. They were broken up by publisher. I don't think the maintainer still updates them, but the Fifth Edition ones are all listed on Atlas's website.
There's a link on the front page of Project: Redcap to the complete product index, hosted at RPGnet.