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Scholars Portal
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Preserved
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2026-03-19
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Preserved : 1 (1 to 4); 2 (1 to 4); 3 (1 to 4); 4 (1 to 4); 5 (1 to 4); 6 (1 to 4); 7 (1, 2-3, 4); 8 (1 to 4); 9 (1 to 4); 10 (1 to 4); 11 (1, 2-3, 4); 12 (1 to 4); 13 (1 to 4); 14 (1 to 4); 15 (1 to 4); 16 (1 to 4); 17 (1 to 4); 18 (1 to 4); 19 (1 to 4); 20 (1 to 4); 21 (1 to 4); 22 (1 to 4); 23 (1 to 6); 24 (1 to 6); 25 (1 to 6); 26 (1 to 6); 27 (1 to 6); 28 (1 to 6); 29 (1 to 6); 30 (1 to 6); 31 (1 to 6); 32 (1 to 6); 33 (1 to 6); 34 (1 to 6); 35 (1 to 6); 36 (1 to 6); 37 (1 to 6); 38 (1 to 6); 39 (1 to 6); 40 (1 to 6); 41 (1 to 6); 42 (1, 3 to 6); 43 (1 to 6)
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Internet Archive
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Preserved
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2025-08-08
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7 to 24
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Portico
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Preserved
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2026-04-02
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Preserved : 1983: 1(1-4), 1984: 2(1-4), 1985: 3(1-4), 1986: 4(1-4), 1987: 5(1-4), 1988: 6(1-4), 1989: 7(1-4), 1990: 8(1-4), 1991: 9(1-4), 1992: 10(1-4), 1993: 11(1-4), 1994: 12(1-4), 1995: 13(1-4), 1996: 14(1-4), 1997: 15(4)
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LOCKSS Archive
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Preserved
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2026-04-06
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1 to 31, 34 to 36
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CLOCKSS Archive
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Preserved
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2026-04-06
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1 to 43
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Portico
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Preserved
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2026-04-02
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Preserved : 1999: 17(3-4)
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Portico
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Preserved
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2026-04-02
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Preserved : 2002: 20(1-2)
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Portico
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Preserved
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2026-04-02
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Preserved : 2004: 22(2, 4), 2005: 23(2, 4-6), 2006: 24(1-5), 2007: 25(1, 3-4), 2008: 26(1-6), 2009: 27(1-6), 2010: 28(1-6), 2011: 29(1-6), 2012: 30(1, 3-4, 6), 2013: 31(1-3, 5-6), 2014: 32(1-6), 2015: 33(2-6), 2016: 34(1-6), 2017: 35(1-6), 2018: 36(1-6), 2019: 37(1-6), 2019/2020: 38(1-6), 2021: 39(1-6), 2022: 40(1-6), 2023: 41(1-6), 2024: 42(1-4), 2025: 43(2-6)
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LOCKSS Archive
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In Progress
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2026-04-06
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32, 33, 37
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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 : 2 (1 to 4); 3 (1 to 6); 4 (1 to 6); 15 (1 to 4); 16 (1 to 4); 17 (1 to 4); 18 (1 to 4); 19 (1 to 4); 21 (1 to 4); 22 (1 to 4); 23 (1 to 6); 24 (1 to 6); 25 (1 to 6); 26 (1 to 6); 27 (1 to 6); 28 (1 to 6); 29 (1 to 6); 31 (1 to 6); 32 (1 to 6); 33 (1 to 6); 34 (1 to 6); 35 (1 to 6); 36 (1 to 6); 37 (1 to 6); 38 (1 to 6); 39 (1 to 6); 41 (1 to 6); 42 (1 to 6)
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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 : 2 (1 to 4); 3 (1 to 6); 4 (1 to 6); 15 (1 to 4); 16 (1 to 4); 17 (1 to 4); 18 (1 to 4); 19 (1 to 4); 21 (1 to 4); 22 (1 to 4); 23 (1 to 6); 24 (1 to 6); 25 (1 to 6); 26 (1 to 6); 27 (1 to 6); 28 (1 to 6); 29 (1 to 6); 31 (1 to 6); 32 (1 to 6); 33 (1 to 6); 34 (1 to 6); 35 (1 to 6); 36 (1 to 6); 37 (1 to 6); 38 (1 to 6); 39 (1 to 6); 41 (1 to 6); 42 (1 to 6)
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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 : 32 (1 to 6)
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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 : 32 (1 to 6)
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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 : 15 (2-4); 16 (1-4); 17 (1-4); 18 (1-4); 19 (1-4); 20 (1-4); 21 (1-4); 22 (1-4); 23 (1-6); 24 (1-6); 25 (1-6); 26 (1-6); 27 (1-6); 28 (supplement-1, 1-6); 29 (1-6); 30 (1-6); 31 (1-6); 32 (1-6); 33 (1-6); 34 (1-6); 35 (1-6); 36 (1-6); 37 (1-5); 115 (2)
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