Christmas Customs Around the World is a 1975 book collecting bits from all over the world- more than most books, including South America, Africa, the Middle East, the Far East and the Antipodes, which most books of this sort generally stick to Europe. It mentions a cookie of which I hadn't heard before the Tirggel- another stamped lebkuchen it looks like, from Zurich. I found it on the internet, and the first reference to it was in a 1461 witch trial court document. Got to try that one. But Mostly I was impressed by how many different regions it covered.
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Hardback