Index of /pdf/rca/spectra70/periph
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   DIR /pdf/rca/spectra70
       70-05-630_DataGatheringSys_Dec67.pdf
       70-06-500_70-500_RandomAccessDevicesSeries_Nov67.pdf
       70-06-653_70_653_CommCtl_Apr65.pdf
       70-06-668_CommCtlMultichan_Ref_Jun68.pdf
       80-70-027_Spectra_IO_Devices.pdf