1970 LIESLER Joseph (1905-2005), Hydrological Decade, graphic/prints - similar motive as realizované post. stamps issue Hydrological Decade from year 1974, color lithography, size 135x190mm, No. 20/201, signed 1920-30 comp. 3 pcs of exlibris, Ludolf Frank, H. K. Frech and Wenceslas Kvapil (1x light stains)