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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 4); 2 (, 1 to 4); 3 (, 1 to 4); 4 (, 1 to 4); 5 (, 1 to 4); 6 (, 1 to 4); 7 (, 1 to 4); 8 (, 1 to 4); 9 (, 1 to 4); 10 (, 1 to 4); 11 (, 1 to 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 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, 2-3, 4, 5-6, 7, 8); 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 7); 39 (, 1 to 7); 40 (, 1 to 7); 41 (, 1 to 7); 42 (, 1, 4 to 7); 43 (, 1 to 7); 44 (, 1 to 7); 45 (, 1 to 7); 46 (, 1 to 7); 47 (, 1 to 7); 48 (, 1 to 7); 49 (, 1 to 4, 6, 7); 50 (, 1 to 7); 51 (, 1 to 3, 4-5, 6, 7); 52 (, 1 to 4, 5-6, 7); 53 (, 1 to 7); 54 (, 1 to 7); 55 (, 1 to 4); 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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1 to 42
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Technische Informationsbibliothek
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Preserved
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2026-01-13
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vol.27:1-6;vol.28:1-6;vol.29:1-1,4-4,7-8,2-3,5-6;vol.30:1-6;vol.31:1-6;vol.32:1-6;vol.33:1-6;vol.34:1-6;vol.35:1-6;vol.36:1-6;vol.37:1-6;vol.38:1-7;vol.39:1-7;vol.40:1-7;vol.41:1-7;vol.42:1-7;vol.43:1-7;vol.44:1-7;vol.45:1-7;vol.46:1-7;vol.47:1-7;vol.48:1-7;vol.49:1-7;vol.50:1-6
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Portico
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Preserved
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2026-02-12
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Preserved : 1971: 1(1-4), 1972: 2(1-4), 1973: 3(1-4), 1974: 4(1-4), 1975: 5(1-4), 1976: 6(1-4), 1977: 7(1-4), 1978: 8(1-4), 1979: 9(1-4), 1980: 10(1-4), 1981: 11(1-4), 1982: 12(1-4), 1983: 13(1-4), 1984: 14(1-4), 1985: 15(1-4), 1986: 16(1-4), 1987: 17(1-4), 1988: 18(1-6), 1989: 19(1-6), 1990: 20(1-6), 1991: 21(1-6), 1992: 22(1-6), 1993: 23(1-6), 1994: 24(1-6), 1995: 25(1-6), 1996: 26(1-6), 1997: 27(1-6), 1998: 28(1-6), 1999: 29(1-8), 2000: 30(1-6), 2001: 31(1-6), 2002: 32(1-6), 2003: 33(1-6), 2004: 34(1-6), 2005: 35(1-6), 2006: 36(1-6), 2007: 37(1-6), 2008: 38(1-7), 2009: 39(1-7), 2010: 40(1-7), 2011: 41(1-7), 2012: 42(1-7), 2013: 43(1-7), 2014: 44(1-7), 2015: 45(1-7), 2016: 46(1-7), 2017: 47(1-7), 2018: 48(1-7), 2019: 49(1-7), 2020: 50(1-7), 2021: 51(1-7), 2022: 52(1-7), 2023: 53(1-7), 2024: 54(1-7), 2025: 55(1-7)
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CLOCKSS Archive
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Preserved
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2026-02-09
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9, 20 to 55
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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 : 3 (1 to 6); 4 (1 to 7); 5 (1 to 7); 26 (1 to 6); 27 (1 to 6); 28 (1 to 6); 29 (1, 2?3, 4, 5?6, 7, 8); 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 7); 39 (1 to 7); 41 (1 to 7); 42 (1 to 7); 43 (1 to 7); 44 (1 to 7); 45 (1 to 7); 46 (1 to 7); 47 (1 to 7); 48 (1 to 7); 49 (1 to 7); 51 (1 to 3, 4-5, 6, 7); 52 (1 to 4, 5-6, 7); 53 (1 to 7); 54 (1 to 7); 55 (1 to 5)
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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 : 3 (1 to 6); 4 (1 to 7); 5 (1 to 7); 26 (1 to 6); 27 (1 to 6); 28 (1 to 6); 29 (1, 2?3, 4, 5?6, 7, 8); 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 7); 39 (1 to 7); 41 (1 to 7); 42 (1 to 7); 43 (1 to 7); 44 (1 to 7); 45 (1 to 7); 46 (1 to 7); 47 (1 to 7); 48 (1 to 7); 49 (1 to 7); 51 (1 to 3, 4-5, 6, 7); 52 (1 to 4, 5-6, 7); 53 (1 to 7); 54 (1 to 7); 55 (1 to 6)
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