There’s no list that I know of, I had to go trawl through archive.org to find everything. Not really sure why it got taken down, other than that the author has said in interviews that he’s kind of a perfectionist and enjoys scrapping art that he’s already done if he thinks it isn’t good enough.

You can kind of see that with my other comment with the older version of this strip. He redid it at least once to add some subtle coloring to draw the viewer’s eye towards the background where they see the vulture and get the joke. Probably just a lot of that sort of thing.