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- [32] PROCESS FOR RECOVERY OF NICKEL, COBALT AND COPPER FROM DOMESTIC LATERITES MINING CONGRESS JOURNAL, 1977, 63 (01): : 29 - 34
- [36] METAL TRACE ELEMENTS IN AGRICULTURE - MANGANESE, COPPER, ZINC, BORON, MOLY, COBALT, ETC JOURNAL OF METALS, 1949, 1 (05): : 8 - 11
- [37] ESCA STUDY OF SULFIDES ANS SULFATES OF MANGANESE, IRON, COBALT, NICKEL, COPPER AND ZINC BULLETIN DE LA SOCIETE CHIMIQUE DE FRANCE PARTIE I-PHYSICOCHIMIE DES SYSTEMES LIQUIDES ELECTROCHIMIE CATALYSE GENIE CHIMIQUE, 1981, (9-10): : 340 - 342
- [39] EFFECT OF COPPER, ZINC, COBALT AND MANGANESE ON GROWTH OF MARINE DIATOM NITZSCHIA-CLOSTERIUM BULLETIN OF THE TORREY BOTANICAL CLUB, 1975, 102 (03): : 100 - 106
- [40] CONTENTS OF ZINC, COPPER, MANGANESE AND COBALT IN LIVER AND MUSCLES OF RABBITS IN E-AVITAMINOSIS UKRAINSKII BIOKHIMICHNII ZHURNAL, 1961, 33 (05): : 732 - &