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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, 2, 3-4, 5, 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 (, 1-2, 3 to 6); 10 (, 1, 2-3, 4-5, 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, 2, 3-4, 5, 6); 19 (, 1, 2, 3-4, 5 to 8); 20 (, 1 to 8); 21 (, 1, 2-3, 4 to 6, 7-8); 22 (, 1, 2-3, 4 to 6, 7-8); 23 (, 1, 2‐3, 4 to 8); 24 (, 1 to 4); 25 (, 1 to 6); 26 (, 1‐2, 3 to 6); 27 (, 1, 2‐3, 4 to 6); 28 (, 1 to 3, 4‐5, 6); 29 (, 1, 2, 3-4, 5, 6); 30 (, 1 to 6); 31 (, 1 to 3, 4-5, 6); 32 (, 1 to 3, 4-5, 6); 33 (, 1 to 4, 5-6); 34 (, 1 to 4, 5-6); 35 (, 1 to 3, 4-5, 6); 36 (, 1 to 3, 4-5, 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 3, 5, 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 3); 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 3
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Technische Informationsbibliothek
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Preserved
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2026-01-13
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vol.26:3-6,1-2;vol.27:1-1,4-6,2-3;vol.28:1-3,6,4-5;vol.29:1-2,5-6,3-4;vol.30:1-6;vol.31:1-3,6,4-5;vol.32:1-3,6,4-5;vol.33:1-4,5-6;vol.34:1-4,5-6;vol.35:1-3,6,4-5;vol.36:1-3,6,4-5;vol.37:1-6,sup.s1,sup.s2;vol.38:1-6,sup.s1;vol.39:1-6;vol.40:1-6;vol.41:1-6;vol.42:1-6;vol.43:1-6;vol.44:1-6;vol.45:1-6;vol.46:1-6;vol.47:1-6;vol.48:1-6;vol.49:1-6
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CLOCKSS Archive
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Preserved
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2026-02-09
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1 to 54
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Portico
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Preserved
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2026-02-12
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Preserved : 1972: 1(1-6), 1973: 2(1-6), 1974: 3(1-6), 1975: 4(1-6), 1976: 5(1-6), 1977: 6(1-6), 1978: 7(1-6), 1979: 8(1-6), 1980: 9(1-6), 1981: 10(1-6), 1982: 11(1-6), 1983: 12(1-6), 1984: 13(1-6), 1985: 14(1-6), 1986: 15(1-6), 1987: 16(1-6), 1988: 17(1-6), 1989: 18(1-6), 1990: 19(1-8), 1991: 20(1-8), 1992: 21(1-8), 1993: 22(1-8), 1994: 23(1, 4-6), 1995: 24(1-4), 1996: 25(1-6), 1997: 26(3-6), 1998: 27(1, 4-6), 1999: 28(1-3, 6), 2000: 29(1-2, 5-6), 2001: 30(1-6), 2002: 31(1-3, 6), 2003: 32(1-3, 6), 2004: 33(1-4), 2005: 34(1-4), 2006: 35(1-3, 6), 2007: 36(1-3, 6), 2008: 37(1-6), 2009: 38(1-6), 2010: 39(1-6), 2011: 40(1-6), 2012: 41(1-6), 2013: 42(1-6), 2014: 43(1-6), 2015: 44(1-6), 2016: 45(1-6), 2017: 46(1-6), 2018: 47(1-6), 2019: 48(1-6), 2020: 49(1-6), 2021: 50(1-6), 2022: 51(1-6), 2023: 52(1-6), 2024: 53(1-6), 2025: 54(1-2, 4-6), 2026: 55(1)
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Portico
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Preserved
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2026-02-12
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Preserved : 1972: 1(1-6), 1973: 2(1-6), 1974: 3(1-6), 1975: 4(1-6), 1976: 5(1-6), 1977: 6(1-6), 1978: 7(1-6), 1979: 8(1-6), 1980: 9(1-6), 1981: 10(1-6), 1982: 11(1-2)
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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 6); 5 (1 to 6); 26 (1?2, 3 to 6); 27 (1, 2?3, 4 to 6); 28 (1 to 3, 4?5, 6); 29 (1, 2, 3?4, 5, 6); 31 (1 to 3, 4?5, 6); 32 (1 to 3, 4?5, 6); 33 (1 to 4, 5?6); 34 (1 to 4, 5?6); 35 (1 to 3, 4?5, 6); 36 (1 to 3, 4?5, 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 to 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 (1 to 6); 54 (1 to 4)
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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 6); 5 (1 to 6); 26 (1?2, 3 to 6); 27 (1, 2?3, 4 to 6); 28 (1 to 3, 4?5, 6); 29 (1, 2, 3?4, 5, 6); 31 (1 to 3, 4?5, 6); 32 (1 to 3, 4?5, 6); 33 (1 to 4, 5?6); 34 (1 to 4, 5?6); 35 (1 to 3, 4?5, 6); 36 (1 to 3, 4?5, 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 to 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 (1 to 6); 54 (1 to 5)
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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 (1-3, 4-5, 6); 36 (1-3, 4-5, 6)
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Library of Congress
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Preserved
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2025-04-07
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1 (1 to 6); 2 (1 to 3-4, 5, 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 (1-2, 3 to 6); 10 (1, 2-3, 4-5, 6); 11 (1, 2, 4 to 6); 12 (1 to 4, 6); 13 (1 to 6); 14 (1 to 4, 6); 15 (1 to 6); 16 (1 to 6); 17 (1, 2, 4 to 6); 18 (1 to 3-4, 5, 6); 19 (1, 2, 5 to 8); 20 (1 to 6, 8); 21 (1, 2-3, 4 to 6); 22 (1, 2-3, 4 to 7-8); 40 (1 to 6); 41 (1 to 6); 42 (1 to 6); 43 (1 to 6); 44 (1 to 6); 45 (1 to 3, 5); 46 (1, 5); 47 (1 to 3, 5, 6); 48 (2 to 4, 6); 49 (1, 4 to 6); 50 (2 to 6); 51 (1 to 6); 52 (1, 4, 6); 53 (2)
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