This is a fascinating collection of myths and legends concerning dragons from around the world. You might use them to inform your own campaign world's dragon legends - how much truth there is in them you will know and the characters will have to find out. Enterprising bards may find resources for their stories and songs here as well.
I'm glad that Y Ddraig Goch (the red dragon) makes an appearance, with the traditional legend of a vision in which a white dragon fought the poor thing to a standstill, being a prediction of England conquering Wales!
Dragons from all over the world are here - Chinese, Albanian... even places I've never heard dragon legends from! The Portuguese dragon Coca gets TWO entries, for some reason, but at least each says something different about her. But Hittite, Iranian, Levantine, Norse or English - Y Ddraig Goch Ddyry Cychwyn! (The Red Dragon takes the lead!)