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Scholars Portal
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Preserved
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2025-09-02
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Preserved : 1 (1 to 6); 2 (, 1 to 6); 3 (, 1 to 6); 4 (, 1 to 6); 5 (, 1 to 6); 6 (, 1 to 6); 7 (, 1 to 6); 8 (, 1 to 6); 9 (, 1 to 6); 10 (, 1 to 6); 11 (, 1 to 6); 12 (, 1 to 6); 13 (, 1 to 6); 14 (, 1 to 6); 15 (, 1 to 6); 16 (, 1 to 6); 17 (, 1 to 6); 18 (, 1 to 6); 19 (, 1 to 6); 20 (, 1 to 6); 21 (, 1 to 6); 22 (, 1 to 6); 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, 6); 33 (, 1 to 6); 34 (, 1); 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 to 6); 43 (, 1 to 6); 44 (, 1 to 6); 45 (, 1 to 6); 46 (, 1 to 6); 47 (, 1 to 6); 48 (, 1 to 6); 49 (, 1 to 6); 50 (, 1 to 6); 51 (, 1 to 6); 52 (, 1 to 6); 53 (, 1 to 6); 54 (, 1 to 8); 55 (, 1 to 8); 56 (, 1 to 8); 57 (, 1 to 9); 58 (, 1 to 9); 59 (, 1 to 8); 60 (, 1 to 3); 1966; 1967; 1968; 1969; 1970; 1971; 1972; 1973; 1974; 1975; 1976; 1977; 1978; 1979; 1980; 1981; 1982; 1983; 1984; 1985; 1986; 1987; 1988; 1989; 1990; 1991; 1992; 1993; 1994; 1995; 1996; 1997; 1998; 1999; 2000; 2001; 2002; 2003; 2004; 2005; 2006; 2007; 2008; 2009; 2010; 2011; 2012; 2013; 2014; 2015; 2016; 2017; 2018; 2019; 2020; 2021; 2022; 2023; 2024; 2025
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Internet Archive
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Preserved
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2025-08-08
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5 to 40
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CLOCKSS Archive
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Preserved
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2026-02-09
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1 to 60
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Portico
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Preserved
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2026-02-12
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Preserved : 1976: 11(5)
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Portico
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Preserved
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2026-02-12
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Preserved : 1985: 20(6)
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Portico
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Preserved
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2026-02-12
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Preserved : 1988: 23(3)
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Portico
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Preserved
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2026-02-12
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Preserved : 1994: 29(1, 3)
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Portico
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Preserved
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2026-02-12
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Preserved : 1997: 32(6), 1998: 33(5-6)
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Portico
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Preserved
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2026-02-12
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Preserved : 2006: 41(4, 6), 2007: 42(2), 2008: 43(1-2, 4)
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Portico
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Preserved
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2026-02-12
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Preserved : 2011: 46(6), 2012: 47(6), 2013: 48(1-4, 6), 2014: 49(1-5), 2015: 50(1-6), 2016: 51(1-6), 2017: 52(1-6), 2018: 53(1-6), 2019/2020: 54(1-8), 2020: 55(1-8), 2021: 56(1, S 1, 2-8), 2022: 57(1-2, S 2, 3-9), 2023: 58(1, S 1, 2, S 2, 3-9), 2024: 59(1-8), 2025/2026: 60(1-7)
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LOCKSS Archive
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In Progress
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2026-02-09
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47, 54
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LOCKSS Archive
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Preserved
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2026-02-09
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48 to 53
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Library of Congress
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Preserved
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2025-04-07
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53 (S1, 1, S2, 2 to 6); 54 (1 to 8); 55 (1 to 8); 56 (1, S1, 2 to 8); 57 (1, S1, S2, 2 to 9); 58 (S1, 1, 2, S2, 3 to 9); 59 (1 to 3)
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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 : 4 (1 to 6); 5 (1 to 6); 32 (1); 33 (2 to 4, 6); 34 (1); 35 (2 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); 43 (1 to 6); 44 (1 to 6); 45 (1, 2, 5, 6); 46 (1 to 6); 47 (1 to 6); 48 (1 to 6); 49 (1 to 6); 51 (1 to 6); 52 (1 to 6); 53 (Suppl 2, 1 to 6); 54 (1 to 8); 55 (1 to 8); 56 (Suppl 1, 1 to 8); 57 (Suppl 2, 1 to 9); 58 (Suppl 1, 1 to 5); 59 (1 to 7)
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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 : 4 (1 to 6); 5 (1 to 6); 32 (1); 33 (2 to 4, 6); 34 (1); 35 (2 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); 43 (1 to 6); 44 (1 to 6); 45 (1, 2, 5, 6); 46 (1 to 6); 47 (1 to 6); 48 (1 to 6); 49 (1 to 6); 51 (1 to 6); 52 (1 to 6); 53 (Suppl 2, 1 to 6); 54 (1 to 8); 55 (1 to 8); 56 (Suppl 1, 1 to 8); 57 (Suppl 2, 1 to 9); 58 (Suppl 1, 1 to 5); 59 (1 to 7)
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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 : 43 (1, 2); 45 (3 to 6); 46 (1 to 3)
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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 : 43 (1, 2); 45 (3 to 6); 46 (1 to 3)
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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 : 32 (6); 33 (5, 6); 35 (5, 6); 36 (1-6); 37 (1-6); 38 (1-6); 39 (1-6); 40 (1-6); 41 (1, 2, 4-6); 42 (1-3, 5, 6); 43 (1-6); 44 (1-6); 45 (1-5); 46 (1-6); 47 (1-6); 48 (1-6); 49 (1-6); 50 (1-6); 51 (1-6); 52 (1-6); 53 (supplement-1, 1-6); 54 (1-5)
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