Analyzing causes of the death of Ferns (Pteridophyta) in the Padang Savana, Taman Nasional Bromo Tengger Semeru (TN-BTS) E Purnomo, N Izzati, RM Hikmah, DS Rusydina, LN Fauzi, ISR Romawan Journal of Natural Sciences and Mathematics Research 7 (2), 73-78, 2021 | | 2021 |