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LOCKSS Archive
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Preserved
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2026-02-09
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1 to 28
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CLOCKSS Archive
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Preserved
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2026-02-09
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16, 18, 20 to 23
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CLOCKSS Archive
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In Progress
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2026-02-09
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17, 19, 24 to 29
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LOCKSS Archive
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In Progress
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2026-02-09
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29
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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 : preprint (216); ; 2 (1 to 9, 11 to 19, 21 to 23); 21 (1, 9, 11); 22 (1 to 9, 11 to 15, 18, 19); 23 (1, 4); 24 (1, 3 to 5); 25 (1); 26
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Portico
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Preserved
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2026-02-12
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Preserved : 1997: 1(1-5), 1998: 2(1-4), 1999: 3(1-2), 2000: 4(1-4), 2001: 5(1), 2002: 6(1-3), 2003: 7(1-14), 2004: 8(1-23), 2005: 9(1-29), 2006: 10(1-23), 2007: 11(1-22), 2008: 12(1-14), 2009: 13(1-13), 2010: 14(1-21), 2011: 15(1-34), 2012: 16(1-18), 2013: 17(1-27), 2014: 18(1-21), 2015: 19(1-19), 2016: 20(1-25), 2017: 21(1-11), 2018: 22(1-15, 18-19), 2019: 23(1-7), 2020: 24(1-7), 2021: 25(1), 2022: 26(1), 2023: 27(1)
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Portico
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Preserved
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2026-02-12
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Preserved : 2025: 29(1)
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