!-      Uucp links
                :       Berknet links
                @       Arpanet links

                                  pdp
                    (Misc)         ! (NC)       (Misc)
           decvax sii  reed  phs--unc--grumpy  duke34  utzoo  cincy teklabs
              ! !  !    !     !    !             !       !      !      !
              ! +--+----+-----+-+--+-------------+-------+------+      !
              !                 !                                      !
              !               duke                                     !
              !                 !                                      !
              !          +------+---+-----------------------+--------+ !
              !          !          !                       !        ! !
     ucbopt   !  hocsr--mhtsa----research   mh135a        harpo-----chico
        :     !          !  !                  !
     ucbcory  !          ! eagle    ihnss   vax135  (Bell Labs)
  (UCB) :     !          !  !        !         !
     ucbvax--++----------+--+--+-----+--+------+--------+
        :    @                 !        !               ! (Silicon Valley)
     ucbarpa @      (UCSD) sdcsvax      !             menlo70--hao
        :    @     sdcattb-----+        !             !    !
     ucbonyx @                 +-----ucsfcgl        sytek sri-unix
             @     phonlab-----+
         cca-unix           sdcarl