Bulgarian geographer Guncho Gunchev (1904-1940)
Unknown author<span style="display: none;">Unknown author</span>
before 1941 <div style="display: none;">date QS:P,+1941-00-00T00:00:00Z/7,P1326,+1941-00-00T00:00:00Z/9</div>
списание "География 21"/Geography 21 Magazine