Llanafan
I research and write about Llanafan often since that's where one of my Welsh family lines comes from. Many years ago while doing research at the Oklahoma Historical Society Library - when it was in it's former lovely location - I came across a book that was just what I needed - this Topographical Dictionary of Wales, published in 1840. Golly Gee Whiz! What a find! Someone in this state must have had quite an interest in Wales in the 1960s for this to end up in the library.
How cool is that?