VMS Help FORTRAN, /CROSS_REFERENCE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  /[NO]CROSS_REFERENCE            D=/NOCROSS_REFERENCE

  Controls whether the storage-map section of the listing file
  includes information about the use of symbolic names.  The
  cross-reference contains the numbers of the lines in which the
  symbols are defined and referenced.

  The default is /NOCROSS_REFERENCE.  The /CROSS_REFERENCE qualifier
  is ignored unless /LIST is specified, either explicitly or by
  default.