Hi Oook! I second Coragyps’s recommendation of the Devonian Times. Look especially at the Who’s Who bit, where there’s pics of the actual fossils as well as drawings etc.
Also Jenny Clack’s book is great, but awfully detailed. (By a spot of serendipity, I’m reading it currently, in tandem with a Pratchett as light relief.) If you get any refs to it, or need any text or pics scanned from it, just let me know. And if you need anything more, I’m in occasional contact with Per Ahlberg, and can ask him. (He lurks regularly over at the IIDB; I’ll have to try and get him here.)
If you can get hold of a copy (try
AbeBooks | Shop for Books, Art & Collectibles), Carl Zimmer’s
At the Water’s Edge is also an excellent introduction to many of the weird names of these early tetrapod fossils.
If you're feeling brave,
this site will tell you more than you probably want to know about these things too; have a browse around the branches of the cladogram at the top. Highly recommended!
For specific papers, try
PubMed, which will give you the abstracts for sure and often the full papers. Try searching on Jenny Clack, Per Ahlberg, Mike Coates, E Daeschler, etc. I have several useful papers as pdfs (thanks to Per!) too.
In a nutshell, give me a shout if there’s anything you need on this.
Cheers, DT