Walter Pickel
Universidade Federal do Rio de Janeiro
Wilhelm Püttmann
Goethe University Frankfurt
M. Wolf
Bielefeld University
Lluı́s Cabrera
Universitat de Barcelona
Alberto Sáez
Universitat de Barcelona
J. Utting
Geological Survey of Canada
Pascal M. Semkiwa
Ministry of Agriculture, Food Security and Cooperatives
Ángeles G. Borrego
Instituto Nacional del Carbón
Janet Dehmer
Cardiff University
A. López-Soler
Institute of Environmental Assessment and Water Research