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1nork Ridge, John Drew, 1909-Gaiak “...Mines and mineral resources Africa Bibliography....”
Argitaratua 1976
Liburua -
2
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3Argitaratua 1958Gaiak “...Mines and mineral resources Great Britain Colonies....”
Aldizkako argitalpena -
4nork Hatcher, PascaleGaiak Connect to electronic resource
Argitaratua 2014
Baliabide elektronikoa eBook