Wikipedia: cy.wikipedia.or ... https://cy.wikipedia.org/wiki/Efrydiau_Athronyddol
Wikipedia: en.wikipedia.or ... https://en.wikipedia.org/wiki/Efrydiau_Athronyddol
Wikidata: www.wikidata.or ... http://www.wikidata.org/entity/Q5347620
FATCAT: fatcat.wiki/con ... https://fatcat.wiki/container/fpqurhgtgvenloqjvxcenpvgym
Wikipedia: cy.wikipedia.or ... https://cy.wikipedia.org/wiki/Efrydiau_Athronyddol
Wikipedia: en.wikipedia.or ... https://en.wikipedia.org/wiki/Efrydiau_Athronyddol
Wikidata: www.wikidata.or ... http://www.wikidata.org/entity/Q5347620
FATCAT: fatcat.wiki/con ... https://fatcat.wiki/container/fpqurhgtgvenloqjvxcenpvgym
Google: www.google.com/ ... https://www.google.com/search?q=ISSN+%220142-3371%22
Bing: www.bing.com/se ... https://www.bing.com/search?q=ISSN+%220142-3371%22
Yahoo: search.yahoo.co ... https://search.yahoo.com/search?p=ISSN%20%220142-3371%22
