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The results of the Mossbauer studies of BiFe1−xMnxO3 multiferroics in a wide temperature range including the temperature of magnetic phase transitions have been presented. The Mossbauer spectra have been analyzed in terms of an incommensurate anharmonic spatial spin-modulated structure (SSMS) of cycloid type model. Information about the effect of the substitution of Mn atoms for Fe atoms on the SSMS and hyperfine parameters of the 57Fe spectrum has been obtained.