"4 microfilm reels, 35 mm"@eng . "Papers of Bogdan Filov (Fond 456)"@eng . "Fond 456, Opis 1. Organized into the following order: Reel 1: File 1-8 p. 22; Reel 2: File 8 p. 22-15 p.30; Reel 4: 15 p.30-24 p.50; Reel 3: File 24 p. 50-27 Arrangement is thematic"@eng . . "Contains a diary, a notebook of income and expenses, and correspondence of Bogdan Filov."@eng . . . . "Papers of Bogdan Filov (Fond 456)"@eng . .