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- [3] SOIL TESTS FOR ZINC, IRON, MANGANESE, AND COPPER CALIFORNIA AGRICULTURAL EXPERIMENT STATION BULLETIN, 1978, (1879): : 40 - 42
- [6] MICRONUTRIENT SOIL TESTS - ZINC, IRON, MANGANESE AND COPPER NORTH DAKOTA AGRICULTURAL EXPERIMENT STATION BULLETIN, 1980, (499): : 18 - 21
- [10] The mixture of zinc in the presence of iron, copper, manganese and magnesium in organic tissues COMPTES RENDUS DES SEANCES DE LA SOCIETE DE BIOLOGIE ET DE SES FILIALES, 1939, 130 : 1209 - 1211