Index of /pdf/att/unix/System_V_Release_4.2
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   DIR /pdf/att/unix
       0130176583_System_V_R4.2_Operating_System_API_Reference_1992.pdf
       0130176745_Programming_with_UNIX_System_Calls_1992.pdf
       0130176826_System_Files_and_Devices_Reference_1992.pdf
       0130426237_Device_Driver_Programming_1992.pdf
       0137266057_Open_Look_Programmers_Guide_1992.pdf