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Department of Macromolecules , Indian Association for the Cultivation of Science, Jadavpur, Calcutta-32. Manuscript received 8 September 1973; revised 17 January 1975; accepted 20 January 1975 Studies on the Infra-red Spectra of Synthetic Humic Adds.doi:10.5281/zenodo.6411673 fatcat:4chi4l3yzjarrc35dk2boaware