Posting this that I found recently, it is in Spanish, but guess that can be translated via Google, can be handy for reference.https://www.monedasuruguay.com/index.htm
I'm BACK!!! Used to be Billet7 on the old forum.
Or you can join the Instituto Uruguayo de Numismática.
They publish a monthly journal, "El Sitio" that used to be available free on their website, but I believe you now need to be a member to download it.
But they have a nice bibliography on their website in English and Spanish.
Good one @pruebas, for a quick look, looks like all previous ones can be downloaded as pdf, no need to be a member for what I can see.