Index of /pdf/burroughs/Disk/B9499
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   DIR /pdf/burroughs/Disk
       1084365_B9499-3_Operation_and_Maintenance_Vol1_197708.pdf
       1095650_B9499-3_Vol3_Apr77.pdf
       1109550_B9499-6_Vol3_Jun78.pdf
       2011342_B9499-6_Disk_Drive_Controller_Vol_1_Oper_and_Maint_1978903.pdf