Index of /pdf/chac/CHAC_Analytical_Engine
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   DIR /pdf/chac
   DIR txt
       1.1_June_1993.pdf
       1.2_October_1993.pdf
       1.3_January_1994.pdf
       1.4_April_1994.pdf
       2.1_July_1994.pdf
       2.2_October_1994.pdf
       2.3_May_1995.pdf
       2.4_August_1995.pdf
       3.1_November_1995.pdf
       3.2_February_1996.pdf
       3.3_May_1996.pdf
       3.4_Fall_1996.pdf
       4.1_Winter_1997.pdf