Index of /pdf/univac/military/1540
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   DIR /pdf/univac/military
       1540_TB.pdf
       PX3334_2_4_TYPE_1540_MAGNETIC_TAPE_UNIT_-AUGUST_72.pdf
       PX3662_UNIVAC_1540_1541_Technical_Description_196602.pdf
       PX3662A_UNIVAC_1540_MAG_TAPE_UNIT.pdf
       PX_3334_1_4_TYPE_1540_MAGNETIC_TAPE_UNIT_MH-1049_Vol_1_April_1976.pdf