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Scholars Portal
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Preserved
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2026-03-19
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Preserved : 48 (2, 3-4); 49 (1 to 4); 50 (1 to 4); 51 (1 to 4); 52 (1 to 4); 53 (1 to 4); 54 (1 to 4); 55 (1 to 4); 56 (1 to 4); 57 (1 to 4); 58 (1, 2); 1969 (none); 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; 2003; 2004; 2005; 2006; 2007; 2008; 2009; 2010; 2011; 2012; 2013; 2014; 2015
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CLOCKSS Archive
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Preserved
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2026-05-04
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45 to 48, 52
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LOCKSS Archive
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Preserved
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2026-05-04
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48 to 56
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Portico
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Preserved
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2026-05-07
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Preserved : 2016: 48(1-4), 2017: 49(1-4), 2018: 50(1-4), 2019: 51(1-4), 2020: 52(1-4), 2021: 53(1-4), 2022: 54(1-4), 2023: 55(1-4), 2024: 56(1-4), 2025: 57(1-4), 2026: 58(1-2)
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CLOCKSS Archive
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In Progress
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2026-05-04
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49 to 51, 53 to 58
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LOCKSS Archive
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In Progress
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2026-05-04
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57, 58
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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 : 48 (2, 3-4); 49 (1-4); 50 (1-4); 51 (1-4)
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British Library
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Preserved
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2019-09-18
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Preserved : 48 (1 to 2), 49 (1 to 4), 50 (1 to 3)
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Library of Congress
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Preserved
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2025-04-07
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48 (1 to 3-4); 49 (1 to 4); 50 (1 to 4); 51 (1 to 4); 52 (1 to 4); 53 (1 to 4); 54 (1 to 4); 55 (1 to 4); 56 (1 to 4)
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