URI:
       Index of /pdf/centuryData/Marksman
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   DIR /pdf/centuryData
       76220-101_Marksman_Disk_Drive_Technical_Manual_Mar79.pdf
       76220-902_Marksman_Performance_Specification_Feb79.pdf
       76220-906_Marksman_Performance_Specification_M20_M40_M80_M160_198203.pdf
       76235-900_Marksman_T_Series_Disk_Tape_Formatter_Performance_Specification_M20_M40_M80_M160_198109.pdf