The covers from the Vanguard series are phenomenally good. I’m envious.
I came to the series relatively late, and got all the physical books as either used paperbacks or trade-paperback publisher’s reprints. In neither case did the interior station diagrams promised on the covers come included. (I was able to grab them off the internet.) I’m hoping Mack’s starcharts make it into Firestorm in a format that will ensure they make it through to ebooks and reprints.