URI:
       Index of /pdf/litton/an_gyk-12
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   DIR /pdf/litton
   DIR government_reports
       TACFIRE_The_Field_Artillaryman_Aug71.pdf
       USACSCS-TF-4-1_TACPOL_Reference_Manual_Jan72.pdf
       USACSCS-TF-4-2_TACPOL_Assembly_Language_Reference_Manual_Jan72.pdf
       USACSCS-TF-4-3_AN_GYK-12_Computer_Principles_of_Operation_Manual_Jan72.pdf