Ghosh, R. C., R. M. Singhal, and T. C. Pathak. 1977. “Comparative Determination of the Spectral Properties and Colloidal Behaviour of Humic Acids of Sal Forest Soils of Doon Valley Planted With <I>Eucalyptus< I>”;. Indian Forester 103 (11):701-7. https://doi.org/10.36808/if/1977/v103i11/11821.