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- [1] VOLCANIC ASH LAYERS IN COAL - ORIGIN, DISTRIBUTION, COMPOSITION AND SIGNIFICANCE ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 1984, 188 (AUG): : 11 - FUEL
- [10] Layers of words and volcanic ash in Japan and Korea JOURNAL OF JAPANESE STUDIES, 2001, 27 (01): : 81 - 111