Heavy metals, especially lead, deposition recorded in an ombrotrophic peat bog near Manchester, United Kingdom G. Le Roux, D. Weiss, A. Cheburkin, N. Rausch, J. Grattant, M. Krachler and W. Shotyk J. Phys. IV France, 107 (2003) 739-742 DOI: 10.1051/jp4:20030407