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

This is the back of F73k_op1_ae2801_v074. Text with ink: The monastery "Saint Omez" on the Pchina River at the foot of Kozak Mountain. 3 Infantry Macedonian Regiment 8,5 x 13,5cm. Postcard. Bulgarian language. Paper. Dirty. Original reference: BOX3; F73k_op1_ae2801_r074.