http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
"A mid-year updating service listing new books, price changes, and out-of- print titles."
Updates information for: Books in print, and: Subject guide to Books in print.
Science/technology-oriented parts also available <1995/1996-> as part of CD-ROM: SciTech reference plus.