The Honourable Society of Cymmrodorion (Anrhydeddus Gymdeithas y Cymmrodorion), often called simply the Cymmrodorion, is a London-based Welsh learned society, with membership open to all.
The Internet Archive is a San Francisco–based nonprofit digital library with the stated mission of "universal access to all knowledge." It provides free public access to collections of digitized materials, including websites, software applications/games, music, movies/videos, moving images, and nearly three million public-domain books.
The National Library of Wales (Llyfrgell Genedlaethol Cymru), Aberystwyth, is the national legal deposit library of Wales and is one of the Welsh Government sponsored bodies.
Transactions of the Honourable Society of Cymmrodorion / Trafodion Anrhydedd Gymdeithas y Cymmrodorion is the annual journal of the Honourable Society of Cymmrodorion, published from 1893 (Vol. I).