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Using the recently proposed R-matrix-Floquet theory we have analysed the multiphoton ionization of atomic hydrogen from the ground state and the metastable 2s state in an intense, linearly polarized and monochromatic laser field. Results are presented for total ionization rates, branching ratios into photon absorption channels (including ATI, above threshold ionization) and angular distributions, for several frequencies and a range of laser intensities. We also discuss the limits of lowest order perturbation theory and we study high-frequency stabilization at high intensities.