Meadow soils occur in large areas in the vicinity of Plovdiv.
Plovdiv has continued to be an important commercial city, having more rail lines radiating from it than Sofia.
Fifteen thousand Bulgarians were massacred in Plovdiv alone.
The ore is processed in flotation plants near the sites of the mines and is refined at Kurdzhali, Plovdiv, and Kurilo.
The forces are distributed among three territorial commands having headquarters at Sofia, Plovdiv, and Sliven.