580 Subfield $a - Linking entry complexity note:
Subfield $a contains the catalog entry for the related title and a statement describing the relationship.
Examples:
580 ## $aContinued in 1982 by: U.S. exports. Schedule E commodity groupings by world area and country.
785 10 $tU.S. exports. Schedule E commodity groupings by world area and country $w(DLC)###84641135
580 ## $aMerged with: Index chemicus (Philadelphia, Pa. : 1977), to form: Current abstracts of chemistry and index chemicus (Philadelphia, Pa : 1978).
785 17 $tIndex chemicus (Philadelphia, Pa. : 1977)$x0160-1482$w(DLC)###83642297
785 17 $tCurrent abstracts of chemistry and index chemicus (Philadelphia, Pa : 1978)$x0161-455X$w(DLC)###83642299
580 ## $aCumulates: Deutsche Bibliographie. Wöchentliches Verzeichnis.
787 1# $tDeutsche Bibliographie. Wöchentliches Verzeichnis
580 ## $aContinued by: Ionospheric predictions issued by the laboratory under its later name: Institute for Telecommunication Sciences and Aeronomy.
785 10 $aInstitute for Telecommunication Sciences and Aeronomy.$tIonospheric predictions
580 ## $aForms part of the Frances Benjamin Johnston Collection.
773 1# $tFrances Benjamin Johnston Collection
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