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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, 2); 2 (, 1, 2); 3 (, 1 to 3); 4 (, 1, 2); 5 (, 1); 6 (, 1, 2); 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 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); 27 (, 5); 29 (, 4 to 6); 30 (, 1 to 6); 31 (, 1 to 5); 33 (, 1 to 6); 34 (, 1 to 6); 35 (, 1 to 8); 36 (, 1 to 8); 37 (, 1 to 8); 38 (, 1 to 8); 39 (, 1 to 8); 40 (, 1 to 6); 41 (, 1, 4 to 8); 42 (, 1 to 8); 43 (, 1 to 8); 44 (, 1 to 8); 45 (, 1 to 8); 46 (, 1 to 8); 47 (, 1 to 8); 48 (, 1 to 8); 49 (, 1 to 8); 50 (, 1 to 8); 51 (, 1 to 8); 52 (, 1 to 8); 53 (, 1 to 8); 54 (, 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; 1998; 2000; 2001; 2002; 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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7 to 9
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Portico
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Preserved
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2026-02-12
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Preserved : 1971/1972: 1(1-2), 1973: 2(1-2), 1974: 3(1-3), 1975: 4(1-2), 1976: 5(1), 1977: 6(1-2), 1978: 7(1-4), 1979: 8(1-4), 1980: 9(1-4), 1981: 10(1-4), 1982: 11(1-4), 1983: 12(1-4), 1984: 13(1-4), 1985: 14(1-4), 1986: 15(1-6), 1987: 16(1-6), 1988: 17(1-6), 1989/1990: 18(1-6), 1990: 19(1-6), 1991: 20(1-6), 1992: 21(1-6), 1993: 22(1-6), 1994: 23(1-6), 1995: 24(1-6), 1996: 25(1-6), 1997: 26(1-6), 1998: 27(1-6), 1999: 28(1-6), 2000: 29(1-6), 2001: 30(1-6), 2002: 31(1-6), 2003: 32(1-6), 2004: 33(1-6), 2005: 34(1-6), 2006: 35(1-6), 2007: 36(1-6), 2008: 37(1-6), 2009: 38(1-6), 2010: 39(1-6), 2011: 40(1-8), 2012: 41(1-8), 2013: 42(1-8), 2014: 43(1-8), 2015: 44(1, S 1, 2-8), 2016: 45(1, S 1, 2-8), 2017: 46(1-8), 2018: 47(1, S 1, 2-8), 2019: 48(1, S 1, 2, S2, 3-8), 2020: 49(1, S1, 2, S2, 3-8), 2021: 50(1, S1, 2-8), 2022: 51(1, S1, 2-8), 2023: 52(1-8), 2024: 53(1-8), 2025: 54(1-8), 2026: 55(1)
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CLOCKSS Archive
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Preserved
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2026-02-09
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15, 20 to 55
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Technische Informationsbibliothek
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Preserved
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2026-01-13
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vol.26:1-6;vol.27:1-6;vol.28:1-6;vol.29:1-6;vol.30:1-6;vol.31:1-6;vol.32:1-6;vol.33:1-6;vol.34:1-6;vol.35:1-8;vol.36:1-8;vol.37:1-8;vol.38:1-8;vol.39:1-8,sup.s1;vol.40:1-8;vol.41:1-8;vol.42:1-8;vol.43:1-8;vol.44:1-8,S1;vol.45:1-8,S1;vol.46:1-8;vol.47:1-8,S1;vol.48:1-8,S1,sup.S2;vol.49:1-8,sup.S1,sup.S2;vol.50:1
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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 8); 5 (S1, 1 to 8); 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 8); 36 (1 to 8); 37 (1 to 8); 38 (1 to 8); 39 (, 1 to 8); 41 (1 to 8); 42 (1 to 8); 43 (1 to 8); 44 (S1, 1 to 8); 45 (S1, 1 to 8); 46 (1 to 8); 47 (S1, 1 to 8); 48 (S1, 1, 2, 4 to 8); 49 (S1, 1 to 8); 51 (S1, 1 to 8); 52 (1 to 8); 53 (1 to 8); 54 (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 : 3 (1 to 6); 4 (1 to 8); 5 (S1, 1 to 8); 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 8); 36 (1 to 8); 37 (1 to 8); 38 (1 to 8); 39 (, 1 to 8); 41 (1 to 8); 42 (1 to 8); 43 (1 to 8); 44 (S1, 1 to 8); 45 (S1, 1 to 8); 46 (1 to 8); 47 (S1, 1 to 8); 48 (S1, 1, 2, 4 to 8); 49 (S1, 1 to 8); 51 (S1, 1 to 8); 52 (1 to 8); 53 (1 to 8); 54 (1 to 7)
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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 : 35 (1-8); 36 (1-8)
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