Kaldybayev R 1

1. Investigation of the Influence of Various Methods of Cotton Harvesting on its Pollution and Other Qualitative Indicators
2. Application of Some Plant Extracts as Biocolorants for Leather During Finishing Process
3. Investigation of the Effect of a Natural Extract from Oak Bark on the Properties of the Leather
4. Investigation of the influence of walnut shell extract on chromium (VI) content in leather
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