Positions of the Bulgarian troops in Belasitsa Mountain / World War I

This is the back of F73k_op1_ae2801_v041. Text with pencil: "The ridge of Belasitsa Mountain with the highest peak Tumba." 17 x 12 cm. Bulgarian language. Paper. Crushed. Dirty. Original reference: BOX3; F73k_op1_ae2801_r041.