Polarized absorption spectra of ferroborates HoFe3(BO3)4, NdFe3(BO3)4 and Ho0.75Nd0.25Fe3(BO3)4 were measured at room temperature in spectral range 4000-24500 cm-1 (400-2500 nm). The studied single crystals were grown from solution-melts. Intensities of the f-f transitions were measured and the Judd-Ofelt parameters Ωλ of Ho3+ and Nd3+ ions in the studied crystals were calculated. It was revealed that the crystals content not strongly influences the Judd-Ofelt parameters. The Ω2 parameter for Ho3+ ion is the most sensitive to the crystal content. Linear dichroism of the hypersensitive transitions appeared to be the largest one for both rare earth ions. Additionally, the linear dichroism of the f-f transitions was measured. The linear dichroism of the "hypersensitive" transitions was the largest one. Correlation of the f-f transitions linear dichroism and the symmetry of the studied crystals was observed. Cover Letter Absorption spectra of HoFe 3 (BO 3) 4 , NdFe 3 (BO 3) 4 and Ho 0.75 Nd 0.25 Fe 3 (BO 3) 4 crystals. Intensities of f-f transitions in π and σ polarizations. Judd-Ofelt parameters of Ho 3+ and Nd 3+ ions in studied crystals. Correlation of f-f transitions linear dichroism with the crystals symmetry.