This means we can print books with 30040s and then create an article (or maybe a wiki page?) containing the same 30041s and Freerse, Coracle and Highlighter would probably display a readable version of the articles and Highlighter and Indextr (the one from nostr:npub1m3xdppkd0njmrqe2ma8a6ys39zvgp5k8u22mev8xsnqp4nh80srqhqa5sf ) would display the proper 30040s as collections.