H. Horsch and I. Kessmann (1982)
Die Eisenrze vom Siedlungsplatz Langweiler 8
Archaeologisches Korrespondenzblatt, 12(2):145-151.
From an archaeological site east of Cologne, 118 samples of iron ores were analyzed; they were grouped into seven types of different origin. Besides oolithic iron ores, there are ironbearing sandstones and siliceous iron ores of sedimentary and vulcano-sedimentary origin. The microscopic properties and the results of geochemical analysis are listed. – AATA
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