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- [7] SOIL TESTS FOR ZINC, IRON, MANGANESE, AND COPPER CALIFORNIA AGRICULTURAL EXPERIMENT STATION BULLETIN, 1978, (1879): : 40 - 42
- [9] MICRONUTRIENT SOIL TESTS - ZINC, IRON, MANGANESE AND COPPER NORTH DAKOTA AGRICULTURAL EXPERIMENT STATION BULLETIN, 1980, (499): : 18 - 21