httpproxy.gopherspace.dk:75/1/proxy/https://bitsavers.org/pdf/ibm/370/DSF/

       Index of /pdf/ibm/370/DSF
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   DIR /pdf/ibm/370
       GC35-0033-16_Device_Support_Facilities_Users_Guide_And_Reference_Rel_13_Mar1991.pdf
       GC35-0033-5_Device_Support_Facilities_Users_Guide_and_Reference_4.0_May81.pdf
       GC35-0033-6_Device_Support_Facilities_Users_Guide_and_Reference_5.0_198110.pdf