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The expansion of Web of Science Core Collection (WoSCC) over the recent yearshas partially accounted for the "norm" of growth of research output in manybibliometric analysis studies. However, the expansion patterns of differentcitation indexes may be different, which may benefit some disciplines buthinder others. Utilizing Science Citation Index Expanded (SCIE), SocialSciences Citation Index (SSCI), and Arts & Humanities Citation Index (A&HCI),this study attempts to elaborate on WoSCC's coverage expansion patterns amongthese three databases from 2001 to 2020. Results show that different fromSCIE/SSCI, both the annual publication volumes in the A&HCI database and allA&HCI journals have remained relatively stagnant in all document typesconsidered scenario or have gained relatively slight increases in only citableitems considered scenario. Although the number of A&HCI journals also hasincreased remarkably, the average journal publication volume of A&HCI journalshas decreased gradually if all document types are considered or kept relativelystagnant when citable items only are considered. Besides, the A&HCI databasehas ceased the systematic index of individually selected items from SCIE/SSCIjournals since 2018. The study finally discusses the possible causes andconsequences of the unbalanced expansion of WoSCC's different citation indexes.

Web of Science Core Collection's coverage expansion:The forgotten Arts & Humanities Citation Index?