Well, i have both books, but i'm not sure that makes be any more qualified since i don't actually have any real life experience forging keris. All i can say is that Groneman has perhaps dedicated more page space to the topic, but i am not convinced that he is necessary 100% accurate on the subject. The Solyoms, on the other hand, are known for having very good accuracy in their accounts. I do like the Groneman book and find much of it useful if not always completely correct.
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