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We report low temperature resistivity measurements of cubic americium hydrides. For all compositions AmH 2+x 0≤x≤0.7, there is a change in temperature dependence of the resistivity at 120 K that is yet unexplained. For AmH 2.6 , there is an additional change observed near 210 K typical of long-range ordering of octahedral hydrogen that is typical of fluorite-type...