Give the beginning date of a serial, integrating
resource, or multi-part resource that is not
yet completed. Follow the date by a hyphen.
Give the beginning and ending dates of a serial,
integrating resource, or multi-part resource that
is completed.
Give the beginning and ending dates of a serial,
integrating resource and multi-part resource
are not known, omit them, and,
optionally,
make a note (see
7B8).