210 Second indicator: Value blank - Abbreviated key title

Value # (blank ) indicates that the abbreviated title is based on the title contained in field 222 (Key Title) . It is assigned by national centers under the auspices of the ISSN Network in accordance with ISO 4, Documentation - Rules for the Abbreviation of Title Words and Titles of Publications and List of Serial Title Word Abbreviations. The abbreviated key title is an agency-assigned data element .