tiompan wrote:
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There is a Ludovic Mann paper on pitchstone and obsidian some where in psas , it's not terrbly exciting iirc but probably worth a read .
here http://ads.ahds.ac.uk/catalogue/adsdata/PSAS_2002/pdf/vol_052/52_140_150.pdf There is a Ludovic Mann paper on pitchstone and obsidian some where in psas , it's not terrbly exciting iirc but probably worth a read .