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Effect of Copper Sulfate Impregnation on the Physical-Mechanical Properties of Sengon and Coconut Wood: Pengaruh Impregnasi Tembaga Sulfat Terhadap Sifat Fisis-Mekanis Kayu Sengon Dan Kelapa. perennial 2026, 22 (2), 93-100. https://doi.org/10.24259/perennial.v22i2.53690.