1. Soil Geography and Landscape Group; Wageningen University, Droevendaalsesteeg 3 (Building 101); PO Box 47 6708 PB, Wageningen, the Netherlands
2. ISRIC - World Soil Information, Droevendaalsesteeg 3 (Building 101); PO Box 353 6708 PB Wageningen the Netherlands
3. INTA-CIRN, Instituto de Suelos; N. Repetto y Los Reseros s/n, 1686 Hurlingham Argentina