@article{12529, author = "Jessen, Niels V. and VIII. International Cartographic Conference and VIII. Meždunarodnaja Kartografičeskaja Konferencija and VIII. Conférence Cartographique Internationale", title = "Hydrogeological Mapping by Use of Cyclogram Technique. Presentation of the Advance in Systematic Hydrological Mapping Exemplified by the First Complet Mapping of a County (Viborg)", year = "1976", note = "separát, 1 sešit", }