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 Timespan:
  (updated 2010-05-01)
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 Citation Databases:
Science Citation Index Expanded (SCI-EXPANDED)--1945-present
Social Sciences Citation Index (SSCI)--1977-present
Arts & Humanities Citation Index (A&HCI)--1977-present
New Conference Proceedings Citation Index- Science (CPCI-S)--1990-present
New Conference Proceedings Citation Index- Social Science & Humanities (CPCI-SSH)--1990-present
 Chemical Databases:
Index Chemicus (IC)--1993-present
Current Chemical Reactions (CCR-EXPANDED)--1986-present
(includes Institut National de la Propriete Industrielle structure data back to 1840)