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The theoretic concepts and social merits are dealt with of the scarcely known Bulgarian doctors--struggling philosophers-marxists (Dr. Peter Genov, 1880-1923, and dr. Stamen Iliev, 1883-1923). Their bold and never retreating struggle against the bourgeois philosophy and ideology in the field of natural history and sociology is outlined. Both are defensors and supporters of the philosophical and methodological basis of marxism-leninsm during one of the most difficult periods in the developent of Bulgarian and international labour and communist movements.