Okpara, K. E. Distribution and Bioavailability of Polycyclic Aromatic Hydrocarbons in Oyster (Saccostrea Cucullate) and Periwinkle (Littorina Littorea) from Sediment in the Sombreiro River Estuary, Niger Delta, Nigeria. Direct Res. J. Public Health and Environ. Technol. 2025, 10 (1), 99-113.