The Use of Smartphones in Geography Learning: A 21st Century Learning Innovation in Identifying Nature Appearances Based on Fieldwork. - Alfi Sahrina; Sumarmi; Purwanto; Fatiya Rosyida; Aziz Bin Shafie; Devi Prasetyono; Agung Suprianto; Muhammad Sainul Fadlan; Mohammad Ainul Labib (Int. J. Interact. Mob. Technol., 2022)