Fy ngwlad:
Photo postcard by Gibson featuring the steamer Stephen Furness (1910-1917), cat no. 669301 on www.Shipping-Postcards.com

How we found a long-lost first world war vessel beneath Irish waters

Mae'r erthygl hon gan Dr Michael Roberts, Ysgol Gwyddorau Eigion, wedi ei ail-chyhoeddi o The Conversation o dan drwydded Creative Commons.

Darllenwch yr erthygl wreiddiol fan hyn.