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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 (, 1); 3 (, 1); 4 (, 1); 5 (, 1); 6 (, 1); 7 (, 1); 8 (, 1); 9 (, 1); 10 (, 1); 11 (, 2); 12 (, 2); 13 (, 1, 2); 14 (, 1, 2); 15 (, 1, 2, 4); 16 (, 2); 17 (, 1, 2-3, 4); 18 (, 1 to 4); 19 (, 1 to 4); 20 (, 1 to 4); 21 (, 1 to 5); 22 (, 1 to 4); 23 (, 1 to 4); 24 (, 1, 2-3, 4); 25 (, 1-3, 4); 26 (, 1-2, 3, 4); 27 (, 1, 2-3, 4); 28 (, 1-2, 3-4); 29 (, 1 to 4); 30 (, 1 to 4); 31 (, 1 to 4); 32 (, 1 to 4); 33 (, 1 to 4); 34 (, 1 to 4); 35 (, 1 to 4); 36 (, 1 to 4); 37 (, 1, 2, 3/4); 38 (, 1 to 4); 39 (, 1 to 4); 40 (, 1 to 4); 41 (, 1 to 4); 42 (, 1 to 4); 43 (, 1 to 4); 44 (, 1 to 4); 45 (, 1 to 4); 46 (, 1 to 4); 47 (, 1 to 4); 48 (, 1 to 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 to 4); 59 (, 1 to 4); 60 (, 1 to 4); 61 (, 1 to 4); 62 (, 1 to 4); 63 (, 1, 2); 64 (, 1, 2); 65 (, 1, 2); 66 (, 1); 67 (, 1, 2); 68 (, 1, 2); 69 (, 1, 2); 70 (, 2); 71 (, 1); 72 (, 1, 2); 73 (, 1, 2); 74 (, 1, 2); 75 (, 1, 2); 76 (, 1, 2); 77 (, 1, 2); 78 (, 1, 2); 79 (, 1); 1947; 1948; 1949; 1951; 1952; 1954; 1955; 1956; 1957; 1958; 1959; 1960; 1961; 1962; 1963; 1964; 1965; 1966; 1967; 1968; 1969; 1970; 1971; 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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29 to 62
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Technische Informationsbibliothek
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Preserved
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2026-01-13
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vol.52:1-4;vol.53:1-4;vol.54:1-4;vol.55:1-4;vol.56:1-4;vol.57:1-4;vol.58:1-4;vol.59:1-4;vol.60:1-4;vol.61:1-4;vol.62:1-4;vol.63:1-2;vol.64:1-2;vol.65:1-2
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CLOCKSS Archive
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Preserved
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2026-02-09
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52 to 65
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Portico
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Preserved
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2026-02-12
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Preserved : 1999: 53(1-2), 2000: 54(1-2), 2001: 55(1-2), 2002: 56(1-2), 2003: 57(1-2), 2004: 58(1-2), 2005: 59(1-2), 2006: 60(1-2), 2007: 61(1-2), 2008: 62(1-2), 2009/2010: 63(1-2), 2010/2011: 64(1-2), 2011/2012: 65(1-2)
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CLOCKSS Archive
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Preserved
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2026-02-09
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1 to 76
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LOCKSS Archive
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Preserved
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2026-02-09
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1 to 78
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LOCKSS Archive
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In Progress
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2026-02-09
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79
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Portico
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Preserved
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2026-02-12
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Preserved : 1947: 1(1), 1947: 2(1), 1948: 3(1), 1949: 4(1), 1949: 5(1), 1951: 6(1), 1951: 7(1), 1952: 8(1), 1954: 9(1), 1955: 10(1)
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Portico
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Preserved
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2026-02-12
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Preserved : 1956: 11(2), 1957: 12(2), 1958: 13(1-2), 1959: 14(1-2), 1960/1961: 15(1-2, 4), 1961: 16(2)
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Portico
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Preserved
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2026-02-12
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Preserved : 1962/1963: 17(1-4), 1963/1964: 18(1-4), 1964/1965: 19(1-4), 1965/1966: 20(1-4), 1966/1967: 21(1-5), 1968: 22(1-4), 1969: 23(1-4), 1970: 24(1-4), 1971/1974: 25(1-4), 1971/1973: 26(1-4), 1974: 27(1-4), 1974/1976: 28(1-2, sup1, 3-4), 1975/1976: 29(1-4), 1976/1977: 30(1-4), 1977/1978: 31(1-4), 1978/1979: 32(1-4), 1979/1980: 33(1-4), 1980/1981: 34(1-4), 1981/1982: 35(1-4), 1982/1983: 36(1-4), 1983/1984: 37(1-4), 1984/1985: 38(1-4), 1985/1986: 39(1-4), 1986/1987: 40(1-4), 1987/1988: 41(1-4), 1988/1989: 42(1-4), 1989/1990: 43(1-4), 1990/1991: 44(1-4), 1991/1992: 45(1-4), 1992/1993: 46(1-4), 1993/1994: 47(1-4), 1994/1995: 48(1-4), 1995/1996: 49(1-4), 1996/1997: 50(1-4), 1997/1998: 51(1-4), 1998/1999: 52(1-4), 1999/2000: 53(1-4), 2000/2001: 54(1-4), 2001/2002: 55(1-4), 2002/2003: 56(1-4), 2003/2004: 57(1-4), 2004/2005: 58(1-4), 2005/2006: 59(1-4), 2006/2007: 60(1-4), 2007/2008: 61(1-4), 2008/2009: 62(1-4), 2009/2010: 63(1-2), 2010/2011: 64(1-2), 2011/2012: 65(1-2), 2012: 66(1), 2013: 67(1-2), 2014: 68(1-2), 2015: 69(1-2), 2016: 70(1-2), 2017: 71(1-2), 2018: 72(1-2), 2019: 73(1-2), 2020: 74(1-2), 2021: 75(1-2), 2022: 76(1-2), 2023: 77(1-2), 2024: 78(1-2), 2025: 79(1-2)
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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 : 5 (4); 6 (1 to 4); 7 (1, 2); 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 to 4); 59 (1 to 4); 61 (1 to 4); 62 (1 to 4); 63 (1, 2); 64 (1, 2); 65 (1, 2); 66 (1); 67 (2); 68 (1, 2); 69 (1, 2); 71 (1, 2); 72 (1, 2); 73 (1, 2); 74 (1, 2); 75 (1, 2); 76 (1, 2); 77 (1, 2); 78 (1, 2)
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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 : 59 (2, 4); 60 (1-4); 61 (1, 2)
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Library of Congress
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Preserved
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2025-04-07
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63 (2); 64 (1, 2); 65 (1, 2); 66 (1); 67 (1, 2); 68 (1, 2); 69 (1, 2); 70 (1, 2); 71 (1, 2); 72 (1, 2); 73 (1, 2); 74 (1, 2); 75 (1, 2); 76 (1, 2); 77 (1, 2); 78 (1, 2)
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