If you really want to be completist, you also need to add The Fireside Watergate and Tales from the Margaret Mead Taproom, with text by Nicholas von Hoffman, and the Jimmy Thudpucker album, Jimmy Thudpucker’s Greatest Hits. Yes, I have all three. Somewhere.
Any other oddities anyone would like to mention?
Oh, I’ve got it. As well as most of the books mentioned in this thread.
And I’ve seen three different productions of the show.
And I still think it sucks with the power of a black hole, cubed.
That would explain it. 
Well, suck though it might, the musical is an important part of the lives of the characters. If someone’s interested in a complete Doonesbury collection for more than just the political satire, the continued story of Doonesbury is missing a chapter without it.