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Yusuf, Arif Rahman, Marji, Marji, Sutadji, Eddy and Sugandi, Machmud (2021) Implementation of Online STEM-PjBL through Various Learning Platforms in Vocational High Schools during Covid-19 Pandemic. Ilkogretim Online-Elementary Education Online, 20 (2). pp. 1-8. ISSN 1305-3515