I've been collecting Roman coins
for a little while now and am looking to expand my horizons into other areas of history that interest me. One such area is the Carolingian Empire. I haven't, however, been able to find much information on their coinage. Could anyone recommend some helpful resources (books, websites, etc) to get me started or perhaps offer advice?
On a more specific note, from what I can tell their does not seem to be much available in the marketplace (at least the places I'm looking). This seems odd to me because from the little I know, it was my understanding that they minted a large amount of silver and gold to facilitate trade, pay off Norse/Maygar raiders, etc.