L'Argonnenbahn - une voie ferrée dans la forêt by Thierry Ehret
Ysec Editions 2017 £5.80
This was a 600mm gauge railway situated in the Ardennes that was first built in 1906 as an 'agricultural' railway, but during WWI was used by the French and German armies. There are many unpublished photos and maps showing the railway in use during the war.