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- [4] CORN RESPONSE TO SULFUR ON ILLINOIS SOILS JOURNAL OF FERTILIZER ISSUES, 1985, 2 (03): : 95 - 104
- [5] RESPONSE OF GREENGRAM TO SULFUR ON CALCAREOUS SOILS INDIAN JOURNAL OF AGRICULTURAL SCIENCES, 1979, 49 (09): : 703 - 706
- [6] GROUTING IN SOUTHEAST MISSOURI DISTRICT TRANSACTIONS OF THE AMERICAN INSTITUTE OF MINING AND METALLURGICAL ENGINEERS, 1949, 181 : 320 - 323