Ghabbour EA, Davies G, Daggett JL, Worgul CA, Wyant GA, Sayedbagheri M-M. Measuring the Humic Acids Content of Commercial Lignites and Agricultural Top Soils in the National Soil Project. AES [Internet]. 2012 Mar. 14 [cited 2024 Apr. 20];6. Available from: https://openjournals.neu.edu/aes/journal/article/view/v6art1