At present the Documentation Collection of the National Museum of History for the period from the end of the Russo – Turkish Liberation War (1878) to September 1944 consists of approximately 4 400 fund items.
According to the bearing information the documents can be classified in several sections:
1. Documents about the historical development of the country;
2. Documents about the political history during the period 1878 – 1944 (state institutions, internal and foreign policy, national liberation movement, wars, etc.)
3. Documents about the culture, science and education during the period 1878 – 1944.
4. Documents about the historical development of the country. The old shares and securities from the beginning of the 20th century are of great interest to the public. The share of the Aeroplan (Aeroplane) Blank Stock Company – Plovdiv, 1912 is one of the most expensive shares nowadays. The collection of lottery tickets from the end of the 19th century to the 1930s is worth seeing. The contract for construction of the Mezdra – Vidin railway line (May, 1908) signed by the Minister of the Public Buildings, Roads and Communications who was a Prime Minister in parallel is a valuable document for the transport development of the country.
5. Documents about the political history during the period 1878 – 1944. The archival materials for the rulers of the Third Bulgarian Kingdom – Kniaz (Prince) Alexander I, Kniaz (Prince) [Tsar (King)] Fedinand I, Tsar (King) Boris III – are an important part of the collection. These are state documents and personal letters written with their own hand or signed by them. The museum also preserves international documents that mark important political events such as for example one of the official legal documents of the Neuilly Peace Treaty (1919). The collection also contains historical information about the wars of Bulgaria from the period 1912 – 1918. Soldier’s correspondence, coded messages and military orders, as well as soldiers’ small format handwritten newspapers, the fruit of the self – publishing initiative of Bulgarian soldiers in 1916 and the voluminous manuscript “War Days 1915 – 1918” by Mayor Boyan Vasilev who was transferred to the reserve, consisting of 960 pages, etc. arose interest. The collection presents documents about the national liberation struggles in Macedonia, Aegean Thrace and Dobrudzha: Todor Alexandrov’s letters from the beginning of the 20th century, the death sentence of Rayko Daskalov passed by the Internal Macedonian Revolutionary Organization in 1923, an Appeal of the Dobrudzha refugees for unity of the Dobrudzha national liberation movement (1928), etc. There are also many documents about the activities of the Bulgarian Exarchate in the lands that remained under the domination of the Ottoman Empire at the beginning of the 20th century.
6. Documents about the culture, science and education during the period 1878 – 1944.
Numerous school certificates, high school and university diplomas, awarded by educational institutions in our country and abroad present the cultural life, education and science. The National Museum of History preserves documents about eminent Bulgarian scientists such as Academician Gavril Katsarov, Professor Vasil Zlatarski, Professor Bogdan Filov and others, as well as about prominent cultural and art personalities: the actors Krastyo Sarafov and Konstantin Kisimov, the producer and actor Vasil Gendov, the opera singers Stefan Makedonski and Elisaveta Yovovich, the artist Vladimir Dimitrov – the Master and others. Archival materials about Bulgarian politicians and public figures who lived and worked towards the end of the 19th century until the 1940s such as Dragan Tsankov, Stefan Stambolov, Dimitar Grekov, Doctor Stoyan Danev, Bogdan Filov, Ekaterina Karavelova and others are the most interesting ones.