Topographic survey of Portugal at 1:50, 000 from the Instituto Geográfico do Exército, the country’s military survey organisation. The maps have contours at 20m intervals & in addition to the standard features shown on topographic mapping at this scale also indicate various types of terrain or vegetation (s&, terraces, rocks, woodlands, vineyards, etc). Each sheet covers an area of 32 x 20km (20 x 12.5 miles approx). The maps have a 1-km UTM grid plus latitude & longitude coordinates for the map corners. Map legend & a glossary of terms used on the maps include English.EDITION DATES: most titles in this series date from 1990s or later. To see all the titles in this series please click on the series link.