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R Purwati, Purwati and Suranto, Suranto and Sajidan, Sajidan and N M, Prasetyanti (2019) Analysis of Problem-Solving Aspect in Biology Electronic Textbooks for 12 th Grade in Indonesia. PROCEEDING 1st International Seminar STEMEIF (Science, Technology, Engineering and Mathematics Learning International Forum) “Strengtheing the STEM Education and Digital Skills”.