This is extrimely rare book in the moment. It's out of print and you can't get it anywere at even close price to this. I get it from the author directly. This is a a set of 4 separate volumes in a luxury hardback folder. By Dimitar Nedialkov . Sofia, October 2001. 4 Volumes each 60 pages, format: 28 x 21 cm, soft cover, parallel text in English and Bulgarian. I also have the 4 volumes for sale separately in my store.
Part I “THE BULGARIAN AIR POTENTIAL AND BALKAN WARS (1892 - 1913)” Operational data on Aircraft flown by Bulgarian Aircrew in the Balkan Wars (Manufacturing nation, number imported, crew numbers, engine type, dimensions, gross weight, ceiling, range, armament, configuration), aircraft types: Bleriot XXI, Bleriot XI, Bleriot XIbis, Bleriot XI – 2, Bleriot XI – 2bis, Voisin, Sommer, Albatros FIII, Bristol, Farman VII, Nieuport IV. 59 unique b&w original photos. The conquest of the Bulgarian skies began with demonstration of spherical balloon flights at the 1892 First International Exhibition in the town of Plovdiv. In 1912 it is also Europe’s first reconnaissance flight in combat conditions, the first deployment of arms from Bulgarian aircraft, and the first joint action by balloons and airplanes to supply ground forces with information. This first book includes information about the Bulgarian military aviation till 1913.
Look inside volume 1. Click on images to enlarge:

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Part II “THE BULGARIAN AIR POTENTIAL IN THE GREAT WAR (1914 - 1919) ” Operational data on Aircraft flown by Bulgarian Aircrew in the great War (Manufacturing nation, number imported, crew numbers, engine type, dimensions, gross weight, speed, ceiling, range, armament, configuration), aircraft types: Albatros B-I, L.V.G.C-II, Otto C-I, Albatros C-III, D.F.W. C-V, Roland D-II, Roland D-III, Fokker E-III, Friedrichshafen FF.33c, Friedrichshafen FF.33L, Rumpler 6B-I, Fokker D-VII, Armstrong Withworth FK8, Nieuport XXIV. Map of the Bulgarian participation in the Great War. Diagram of the Bulgaria Air Army staff in 1917 and 1918. 81 unique b&w original photos. After the Bulgaria’s defeat in the Second Balkan War was opened the airplane workshop, the first Airplane School. Asen Yordanoff designed the first Bulgarian biplane and flew with it on 7 August 1915.
Look inside volume 2. Click on images to enlarge:

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Part III “THE REVIVAL OF BULGARIAN AIR POWER BETWEEN THE WORLD WARS (1920 - 1939)” Operational data on Aircraft flown by Bulgarian Aircrew between the World Wars (Manufacturing nation, number imported, crew numbers, engine type, dimensions, gross weight, speed, ceiling, range, armament, configuration), aircraft types: Potez VIII, Caudron S-59, Bristol Lucifer, Henriot XIV, Avro – 522, Potez XVII, Bristol 28A, Smolik S-18, Macchi 18/2000, Junkers F-13, Albatros L-73, Fw A-20, Junkers K-23, Heinkel He-42, Junkers W-34, Caudron 440, Heinkel He-45B, Heinkel He-51B, Dornier Do-11, Arado Ar-65, PZL-24B, PZL-43B, Junkers Ju-52/3m, Fw-58B/E, Heinkel He-72, Fw-56, Fw-44, Avia B-534, Letov S-328, Avia B-71, Bloch MB-200, Aviia B-122, Aero A-304, PWS-26, Grigorov-I, Uzunov –I, DAR I, DAR II, DAR-I A, DAR III, IV, V, VI, VI-A, VII, VIII, VIII-A, KB -1, 2 UT, 2A, 3, 4, 5. Map of the disposition of Bulgarian Air forces to the end of 1939. Diagram of the Bulgaria Air Army staff in 1939 – command components and main battle components subsystem. 140 unique b&w original photos.
Look inside volume 3. Click on images to enlarge:

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Part IV “THE BULGARIAN AIR FORCE IN ACTION DURING THE SECOND WORLD WAR (1940 - 1946)” Operational data on Aircraft flown by Bulgarian Aircrew between in period between 1940 - 1946 (Manufacturing nation, number imported, crew numbers, engine type, dimensions, gross weight, speed, ceiling, range, armament, configuration), aircraft types: Bu-131, Ar-96B-2, Me-109E-4/7, Do-17 P/m, KB-6, Me –108, Fi-156, Do –17Kb-1, DAR – 9, 10, 10A, KB – 11, 11A, Ar-196A-3, Ju-87R-2/4, Me-109G-2/4, D-520, B-135B, Bu-181, He –111, Ju-87D-5, Me-109G-6, FW-189A, DAR –10F, Yak 9M, IL-2M-3, Pe –2, Yak-9U. Map of the disposition of Bulgarian Air Forces to August 1944. Diagram of the Bulgaria Air Army staff in 1944 – command components and main battle components subsystem, air Eskadra, support components. 86 unique b&w original photos.
Look inside volume 4. Click on images to enlarge: