German, Hardcover (1999)
VERY detailed and thorough study of the fortifications built in the region between 1870 and 1918.
French, Divers (1882)
Dutch, Paperback (2001)
French, Paperback (1876)
EXTREMELY RARE, ORIGINAL French publication from 1876 on battery construction.
French, Hardcover (1879)
VERY RARE, ORIGINAL French manual from 1879/1880 on field fortification(s) and how to construct them.