Index of /pdf/burroughs/ReferenceCards
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   DIR /pdf/burroughs
       1044849_B6500_RefCard_Nov_69.pdf
       1079936_B6700_B7700_APL700_RefCard_1974.pdf
       5001050_B6700_B7700_CANDE_RefCard_Jul_75.pdf
       5011349_B7000_B6700_CANDE_RefCard_Oct_79.pdf