The area around the Sasso San Gottardo fortifications, build to protect access to the Gotthard Pass, presented in the Swisstopo’s “ Once & Today” series on extracts from topographic survey mapping from mid-1800s to the present day & on aerial photos. Map extracts range from the 1851 survey, the oldest topographic mapping of the Gotthard region, to a special 1:10, 000 map declassified only in 2009 & the present day 1:25, 000 topographic survey mapping with the underground fortifications overprinted on it. The title also
Includes:: panels showing coverage of the area by artillery ranges & examples of how stereoscopic photographs helped in surveying the region more accurately. Map legend & the accompanying text include English. For the list of other titles in this series please click on the series link.