Anirudh P. Singh and M.K. Nautiyal VN. Spectroscopic Characterization of Humic Acids Extracted From Different Type of Soils of Punjab. JISSS [Internet]. 2017 May 9 [cited 2025 Oct. 19];65(1). Available from: https://epubs.icar.org.in/index.php/JISSS/article/view/70251