Sah S, Dutta S. Palyno-stratigraphy of the sedimentary formations of Assam: 1. Stratigraphical positions of the Cherra formation. JPS [Internet]. 1966 Dec. 31 [cited 2024 Apr. 30];15((1-3):72-86. Available from: https://jpsonline.co.in/index.php/jop/article/view/750