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Morphology and Petrography of Volcanic Ashes

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4Â¥: Originally posted by Ñ²¨ at 2015-01-10 09:11:19
http://pan.baidu.com/s/1sjO9JwL

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6Â¥: Originally posted by yongsheng4 at 2015-01-11 02:34:16
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