At ELRepo, we prune older packages to save disk space and keep the repo size from growing forever. Then, from time to time we receive requests for the ones that have been removed.
In response to those requests, we have created a new repository "archive". Any packages in the elrepo and extras repositories that are older than 21 day old are duplicated there. Not all mirrors carry the archive repo. Currently there are 4 mirrors and they are marked on the mirror list found on our Download page.