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STAN, Basic Science and Technology for Primary Schools, Students Book 5
Book 5, Theme 2, Chapter 7: Acids and Bases, Ibadan, University Press PLC -
STAN Primary Science (2nd Ed)
Books One, two and three, Modules 3, 4 and 5: Using the senses; sense of hearing, smell, Taste and Touch; Water and Measurement, Ibadan, University Press PLC