URI:
       Index of /pdf/cdc/discs/floppy/9406
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   DIR /pdf/cdc/discs/floppy
       75897474T_9406-2_3_8in_DSDD_Floppy_Hardware_Maint_Manual_198102.pdf
       77614903AM_9406_Flexible_Disk_Description_Jun82.pdf
       77653520D_9406-4_Flexible_Disk_Drive_Hardware_Maintenance_Manual_Feb83.pdf
       CDC_9406-4_ad_198111.pdf