http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Readers' guide to periodical literature, 0034-0464
Readers' guide abstracts (microform), 0034-0464
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Issues for Apr.-May 1988 have no vol. numbering but constitute v. 35, no. 4 and no. 5.