You may have seen links in a number of documents of current interest, including the Trial Memorandum of the U.S. House of Representatives in the Impeachment Trial of President Donald J. Trump (archived at and the Trial Memorandum of President Donald J. Trump (archived at Interestingly, both documents cite Perma links without citing the original URL that Perma archived; generally, you would include both in your citation.

As an exercise, I used Perma's public API to look up the URLs for the Perma links cited in these two documents; here are CSV files listing the 148 links in the House Memorandum (one ill-formed) and the 129 links in the President's memorandum. (Note that both CSV files include duplicates, as some links are repeated in each document; I'm leaving the duplicates in place in case you want to read along with the original documents.)