directory     file
  =========     ====

  ascii         gopher.prot-rfc1436
  ascii         xemacsref.txt
  postscript    ip-udp-tcp-headers.ps
  postscript    tcp-state-diagram.ps
  postscript    unix-tss.ps
  postscript    xemacsref.ps
  postscript    lions-commentary.ps
  pdf           ip-udp-tcp-headers.pdf
  pdf           sun_openboot-quickref.pdf
  pdf           tcp-state-diagram.pdf
  pdf           unixhistory.pdf
  pdf           unixindex.pdf
  pdf           viref.pdf
.