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Tribrata, Y., Siahaan, R., Pelealu, J.J. and Mambu, S.M. 2015. Kepadatan Cacing Tanah pada Lahan Pertanian Tomat Terpapar Pestisida di Desa Ampreng, Kecamatan Langowan Barat - Provinsi Sulawesi Utara (Earthworm Density in Tomato Farming Exposed to Pesticides at Ampreng Village, Langowan Barat Sub District – North S. JURNAL BIOS LOGOS. 5, 1 (Feb. 2015). DOI:https://doi.org/10.35799/jbl.5.1.2015.7045.