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5
Towards a review of the EC Recommendation for a definition ..
EUR, Scientific and technical research series, 26567
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6
Towards a review of the EC Recommendation for a definition ..
EUR, Scientific and technical research series, 26567
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7
Towards a review of the EC Recommendation for a definition ..
EUR, Scientific and technical research series, 26744
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8
Contributions to economic geology (short papers and prelimi..
United States congressional serial set ; serial set no. 6649;House document / 63rd Congress, 2nd session. House ; no. 785
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9
Contributions to economic geology (short papers and prelimi..
United States congressional serial set ; serial set no. 6638;House document / 63rd Congress, 2nd session. House ; no. 307
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10
Contributions to economic geology (short papers and prelimi..
United States congressional serial set ; serial set no. 6415;House document / 62nd Congress, 3rd session. House ; no. 1426