For links that are now defunct/gone (such as #2 on the chronological list), can you pull the web archive at the closest date to the submission?

(dead) http://yorktownhistory.org/homepages/1900_predictions.htm ===> https://web.archive.org/web/20100108205037/http://yorktownhi... (archive from 6 days later)

I don't think this can be done programmatically though... thanks for putting this together. I enjoy the old posts a lot, too.