Occurrence, distribution, and pollution indices of potentially toxic elements within the bed sediments of the riverine system in Pakistan von Nawab, Javed, Din, Zia Ud, Ahmad, Riaz, Khan, Sardar, Zafar, Mazhar Iqbal, Faisal, Shah, Raziq, Waleed, Khan, Hamza, Rahman, Zia Ur, Ali, Abid, Khan, Muhammad Qayash, Ullah, Sajid, Rahman, Abdur

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