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Scholars Portal
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Preserved
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2025-09-02
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Preserved : 39 (3, 4, 6); 40 (, 1, 2, 5, 6); 41 (, 1 to 6); 42 (, 1 to 6); 43 (, 1 to 6); 44 (, 1 to 6); 45 (, 1 to 4, 5-6); 46 (, 1 to 6); 47 (, 1 to 9); 48 (, 1 to 9); 49 (, 1 to 9); 50 (, 1 to 9); 51 (, 1 to 9); 52 (, 1 to 9); 53 (, 1 to 9); 54 (, 1 to 9); 55 (, 1 to 9); 56 (, 1 to 9); 57 (, 1 to 9); 58 (, 1 to 9); 59 (, 1 to 4, 6 to 9); 60 (, 1 to 9); 61 (, 1 to 6, 7-8, 9); 62 (, 1 to 6, 7-8, 9); 63 (, 1 to 3, 4-5, 6 to 9); 64 (, 1 to 9); 65 (, 1 to 9); 66 (, 1 to 9); 67 (, 1 to 5); 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 48
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CLOCKSS Archive
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Preserved
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2026-02-09
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1, 2, 4, 33 to 68
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Portico
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Preserved
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2026-02-12
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Preserved : 1969: 10(3-4), 1969/1970: 11(1-4), 1970: 12(1-4), 1971: 13(1-4), 1972/1973: 14(1-4), 1973: 15(1-4), 1974: 16(1-4), 1975: 17(1-4), 1976: 18(1-4), 1977: 19(1-4), 1978: 20(1-4), 1979: 21(1-6), 1980: 22(1-6), 1981: 23(1-6), 1982: 24(1-6), 1983: 25(1-6), 1984: 26(1-6), 1985: 27(1-6), 1986: 28(1-6), 1987: 29(1-6), 1988: 30(1-6), 1989: 31(1-6), 1990: 32(1-6), 1991: 33(1-6), 1992: 34(1-6), 1993: 35(1-6), 1994: 36(1-6), 1995: 37(1-6), 1996: 38(1-6), 1997: 39(1-6), 1998: 40(1-6), 1999: 41(1-6), 2000: 42(1-6), 2001: 43(1-6), 2002: 44(1-6), 2003: 45(1-4), 2004: 46(1-6), 2005: 47(1-9), 2006: 48(1-9), 2007: 49(1-9), 2008: 50(1-9), 2009: 51(1-9), 2010: 52(1-9), 2011: 53(1-9), 2012: 54(1-9), 2013: 55(1-9), 2014: 56(1-9), 2015: 57(1-9), 2016: 58(1-9), 2017: 59(1-9), 2018: 60(1-9), 2019: 61(1-9), 2020: 62(1-9), 2021: 63(1-9), 2022: 64(1-9), 2023: 65(1-9), 2024: 66(1-9), 2025: 67(1-9), 2026: 68(1-2)
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Portico
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Preserved
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2026-02-12
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Preserved : 1950/1951: 1(1-2), 1951/1953/1954/1955: 2(1-15), 1956/1957: 3(1-4), 1958/1959: 4(1-4), 1960/1961: 5(1-4), 1961/1962: 6(1-s4), 1962/1963: 7(1-4), 1963/1964/1965: 8(1-4), 1965/1966/1967: 9(1-4), 1967/1968: 10(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 : 4 (1 to 6); 5 (, 1 to 9); 6 (1 to 9); 39 (1 to 6); 41 (1 to 6); 42 (1 to 6); 43 (, 1 to 6); 44 (1 to 6); 45 (1 to 4, 5?6); 46 (1 to 6); 47 (1 to 9); 48 (1 to 9); 49 (1 to 9); 51 (1 to 9); 52 (1 to 9); 53 (1 to 9); 54 (1 to 9); 55 (1 to 9); 56 (1 to 9); 57 (1 to 9); 58 (1 to 9); 59 (1 to 9); 61 (1 to 6, 7-8, 9); 62 (1 to 6, 7-8, 9); 63 (1 to 3, 4-5, 6 to 9); 64 (1 to 4, 6 to 9); 65 (1 to 5, 7 to 9); 66 (1 to 9); 67 (1 to 7)
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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 : 4 (1 to 6); 5 (, 1 to 9); 6 (1 to 9); 39 (1 to 6); 41 (1 to 6); 42 (1 to 6); 43 (, 1 to 6); 44 (1 to 6); 45 (1 to 4, 5?6); 46 (1 to 6); 47 (1 to 9); 48 (1 to 9); 49 (1 to 9); 51 (1 to 9); 52 (1 to 9); 53 (1 to 9); 54 (1 to 9); 55 (1 to 9); 56 (1 to 9); 57 (1 to 9); 58 (1 to 9); 59 (1 to 9); 61 (1 to 6, 7-8, 9); 62 (1 to 6, 7-8, 9); 63 (1 to 3, 4-5, 6 to 9); 64 (1 to 4, 6 to 9); 65 (1 to 5, 7 to 9); 66 (1 to 9); 67 (1 to 8)
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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 (1, 2, 4-7, 9); 49 (1-9)
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Library of Congress
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Preserved
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2025-04-07
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1 (2); 49 (2, 6); 56 (3 to 5); 57 (1 to 9); 58 (1 to 5, 7); 59 (1 to 3, 6 to 8); 60 (1, 3 to 6, 8, 9); 61 (1 to 3, 7-8, 9); 62 (3 to 7-8, 9); 63 (1 to 4-5, 6 to 8); 64 (1 to 9); 65 (1, 5, 6, 8); 66 (3)
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