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|title=What is a generation data group? |website=IBM.com}}</ref> that are successive generations of historically-related data<ref name=G.sets>{{cite web |title=Generation data sets
|quote=successive, historically related, |url=https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.3.0/com.ibm.zos.v2r3.ieab500/iea3b5_Generation_data_sets_.htm}}</ref> stored on an IBM mainframe (running [[OS/360 and successors|OS]] or [[DOS/360_and_successors|DOS/VSE]]).<ref name=VSE.VSAM>{{cite web
|title=VSE/VSAM Commands |url=
A GDG is usually cataloged.<ref name=G.sets/>
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