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A global geochemical database for environmental and resource management : recommendations for international geochemical mapping : final report of IGCP Project 259 / by A.G. Darnley ... [et al.] ; sponsored by International Union of Geological Sciences ... [et al.].
- 551.90285574 I111
- IGCP Project 259.
- UNESCO,
- 1995.
- Paris :
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Integral study of the silk roads : roads of dialogue.
- 910.9 I61112
- UNESCO,
- [199?]
- Paris :