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- [5] Characterization of humic and fulvic acids extracted from two major soils of Punjab. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 1999, 217 : U55 - U55
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- [10] ANALYTICAL CHARACTERISTICS OF HUMIC ACIDS EXTRACTED FROM MALNAD SOILS OF KARNATAKA MYSORE JOURNAL OF AGRICULTURAL SCIENCES, 1978, 12 (02): : 233 - 238