Now that subfield $u has been implemented in the 670 field, it it OK to include URls at will in NARs?
Within reason. Although subfield $u was authorized for use in NARs on February 1, 2006, NACO catalogers are expected to judiciously apply its use. Optional use of the 670$u should be for those cases when the source contains significant information related to the established heading that cannot be cited succinctly in the 670. Remember—citing a URI in 670$u does not take the place of the requirement to cite relevant data in subfields $a and $b of the 670 (i.e., enough information to support the heading/references, which will be available to future users even if the Internet site itself disappears).
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