Surange K. Walther Gothan and Hermann Weyland - 1954. "Lehrbuch Der Palaobotanik ", 535 Pp. Akademie Verlog., Berlin. JPS [Internet]. 1954 Dec. 31 [cited 2024 May 20];3:129. Available from: https://jpsonline.co.in/index.php/jop/article/view/442