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

This is the back of F73k_op1_ae2801_v011. Text with pencil: "Belasitsa in fog. ". 21,5 x 12 cm. Bulgarian language. Unknown position. Paper. Torn on one side. With spots. Original reference: BOX3; F73k_op1_ae2801_r011.