Keywords: Postcard of Postojna Cave 1930s (3).jpg Postcard of Postojna Cave s 1930 https //www kupindo com/Srbija-i-ex-YU-do-1945/31647261_Razglednica-Postojnska-jama-Slovenija-1399- author PD-Slovenia 1930s postcards of Slovenia Postcards of the interior of Postojna Cave Images from Kupindo |