Index of /pdf/dec/pdp10/catalogs
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   DIR /pdf/dec/pdp10
       DEC-10-XSPLA-E-D_DECsystem-10_Software_Components_Catalogue_Jul75.pdf
       DEC-10-XSPLA-J-D_DECsystem-10_20_Software_Components_Catalogue_Oct76.pdf
       DECSYSTEM_10_Maintenance_Manuals.pdf