Sopper, W. E. (1993). Municipal sludge use in land reclamation. Lewis Publishers.
Chicago-čujuhus (17. p.)Sopper, William E. Municipal Sludge Use in Land Reclamation. Boca Raton: Lewis Publishers, 1993.
MLA-čujuhus (9. p.)Sopper, William E. Municipal Sludge Use in Land Reclamation. Lewis Publishers, 1993.
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