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Yansah, E., Yokos Pranata and Nurlia Latipah 2024. Development and Validation of a Problem-Based Learning (PBL)-Based Science Worksheet on Environmental Pollution for Grade VII Junior High School Students. ISEJ : Indonesian Science Education Journal. 5, 3 (Sep. 2024), 120-129. DOI:https://doi.org/10.62159/isej.v5i3.1784.