Map Portal as a Tool to Share Information on Cultural Heritage Illustrated by the National Heritage Board Geoportal. - Anna Fiedukowicz; Andrzej Glazewski; Arkadiusz Kolodziej; Krzysztof Koszewski; Pawel Kowalski; Robert Olszewski; Leszek Wlochynski (DCH@ICE/ITMC, 2017)