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LOCKSS Archive
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Preserved
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2026-04-06
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1 to 5
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CLOCKSS Archive
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Preserved
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2026-04-06
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1 to 7
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Portico
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Preserved
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2026-04-02
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Preserved : 2008: 1(1), 2009: 2(1), 2010: 3(1), 2011: 4(1), 2012: 5(1, S 1), 2013: 6(1), 2014: 7(1), 2015: 8(1), 2016: 9(1)
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CLOCKSS Archive
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Preserved
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2026-04-06
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1 to 9
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LOCKSS Archive
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Preserved
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2026-04-06
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6 to 9
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National Digital Preservation Program, China
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Preserved
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2025-10-23
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Preserved : 1; 2; 3; 4; 5; 6; 7; 8; 9
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National Digital Preservation Program, China
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Preserved
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2025-12-04
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Preserved : 1; 2; 3; 4; 5; 6; 7; 8; 9
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British Library
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Preserved
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2019-09-18
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Preserved : 1 (1), 2 (1), 3 (1), 4 (1), 5 (1; Supp 1)
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National Library of the Netherlands
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Preserved
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2024-12-15
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Preserved : 1; 2; 3; 4; 5; 6; 7
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Library of Congress
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Preserved
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2025-04-07
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3 (1); 4 (1); 5 (S1, 1); 6 (1); 7 (1); 8 (1); 9 (1)
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