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6by California. Division of Mines and Geology. [from old catalog] 56839, Division of mines 56841
Published 1954Texto bibliotecaUNCO AR -
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8by United States Departament of the Interior Bureau of Mines
Published 1963Texto bibliotecaUNCO AR -
9by Mrs. Meaza Termat, Ministry of Mines, Ethiopia
Published 2016-12-14T05:37:21ZMeeting Document bibliotecaONU -
10Texto bibliotecaFAO IT
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11Texto bibliotecaFAO IT
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12by Ministry of Mines and steel development, ENGR. Charles Uka
Published 2016-12-14T05:37:15ZMeeting Document bibliotecaONU -
13by British Columbia. Department of Mines and Petroleum Resources. 67097
Published 1968Texto bibliotecaUNCO AR -
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15Texto bibliotecaUNCO AR
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16by Ministry of mines and steel development, Mr. O.Z. Azubike
Published 2016-12-14T05:37:22ZMeeting Document bibliotecaONU -
17book bibliotecaUNESCO
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18Texto bibliotecaFAO IT
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19Texto bibliotecaFAO IT
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20