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

This is the back of F73k_op1_ae2801_v075. Text with pencil: View from Mount Galabak to Belasitsa, D. Kapia. 21 Artillery Regiment. 12,5 x 17,5cm. Bulgarian language. Paper. With spots. Original reference: BOX3; F73k_op1_ae2801_r075.