The climate in north-western Europe during the Younger Dryas : a comparison of multi-proxy climate reconstructions with simulation experiments / René F.B. IsarinSub-arctic rivers in northern Russia : the influence of vegetation, landscape, climate and hydrology on the river morphology of two catchment areas in Northeast-European Russia / J.J.W. de MoorGroundwater recharge and resources assessment in the Botswana Kalahari : executive summary GRES II / H.E. Beekman, E.T. Selaolo, J.J. de Vries ; [fotogr.: H.E. Beekman]