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2. Degradative studies on a soil humin fraction—Sequential degradation of inherited humin
3. Andisols from Four Different Regions of Iceland
4. O mechanizmie "stymulującego" wpływu humianu sodu na proces fermentacji alkoholowej i rozmnażanie drożdży [On the mechanizm of the "stimulating" influence of Na-humate upon the process of alcoholic fermentation and multiplication of yeasts]
5. The role of humic acids from Tasmanian podzolic soils in mineral degradation and metal mobilization