Internet Archive
1963-2014
Preserved
2025-08-08
1 to 51
Scholars Portal
1963-2025
Preserved
2025-09-02
Preserved : 1 (1 to 6); 2 (, 1 to 6); 3 (, 1 to 6); 4 (, 1 to 10); 5 (, 1 to 10); 6 (, 1 to 11); 7 (, 1 to 8, 9-10, 11, 12); 8 (, 1-2, 3, 4, 5-6, 7, 8, 9-10, 11, 12); 9 (, 1-2, 3 to 10); 10 (, 1 to 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 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 to 6); 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 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 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 6); 55 (, 1 to 6); 56 (, 1 to 6); 57 (, 1 to 6); 58 (, 1 to 6); 59 (, 1 to 6); 60 (, 1 to 6); 61 (, 1 to 6); 62 (, 1 to 3); 1963; 1964; 1965; 1966; 1967; 1968; 1969; 1970; 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
CLOCKSS Archive
1963-2025
Preserved
2026-02-09
1 to 62
Portico
1964-1972
Preserved
2026-02-12
Preserved : 1964: 1(5), 1965: 2(4-6), 1965/1966: 3(1, 3-6), 1966/1967: 4(1-2, 5, 7-8), 1967/1968: 5(2-3, 6-8, 10), 1968/1969: 6(1, 3-5, 7, 9), 1969/1970: 7(1-12), 1970/1971: 8(1-3, 5-12), 1972: 9(7)
Portico
1973-1977
Preserved
2026-02-12
Preserved : 1973: 10(6), 1974: 11(2, 5-6), 1975: 12(2-3, 5), 1976: 13(4, 6), 1977: 14(2, 5)
Portico
1980-1982
Preserved
2026-02-12
Preserved : 1980: 17(4), 1981: 18(4), 1982: 19(2)
Portico
1985-1985
Preserved
2026-02-12
Preserved : 1985: 22(2)
Portico
1987-1987
Preserved
2026-02-12
Preserved : 1987: 24(6)
Portico
1989-1991
Preserved
2026-02-12
Preserved : 1989: 27(1), 1990/1991: 28(1, 3)
Portico
1992-1992
Preserved
2026-02-12
Preserved : 1992: 29(3, 5), 1992: 30(1)
Portico
1994-1994
Preserved
2026-02-12
Preserved : 1994: 31(3)
Portico
1995-2025
Preserved
2026-02-12
Preserved : 1995: 32(5-6), 1996: 33(4), 1996/1997: 34(1-6), 1997/1998: 35(1-6), 1998/1999: 36(1-6), 1999/2000: 37(1-6), 2000/2001: 38(1-6), 2001/2002: 39(1-6), 2002/2003: 40(1-6), 2003/2004: 41(1-6), 2004/2005: 42(1-6), 2005/2006: 43(1-6), 2006/2007: 44(1-6), 2008: 45(1-6), 2009: 46(1-6), 2010: 47(1-6), 2011: 48(1-6), 2012: 49(1-5), 2013: 50(1-6), 2014: 51(1-5), 2015: 52(2-6), 2016: 53(1-6), 2017: 54(1-6), 2018: 55(1-6), 2019: 56(1-6), 2020: 57(1-6), 2021: 58(1-6), 2022: 59(1-6), 2023: 60(1-6), 2024: 61(1-6), 2025: 62(1-6)
LOCKSS Archive
2012-2019
In Progress
2026-02-09
49, 56
LOCKSS Archive
2013-2018
Preserved
2026-02-09
50 to 55
Library of Congress
2018-2024
Preserved
2025-04-07
55 (2 to 6); 56 (1 to 6); 57 (1 to 6); 58 (1 to 6); 59 (1 to 6); 60 (1 to 6); 61 (1 to 6)
National Digital Preservation Program, China
1997-2024
Preserved
2025-10-23
Preserved : 4 (1 to 6); 5 (1 to 6); 6 (1 to 6); 34 (2 to 5); 35 (1 to 6); 36 (1 to 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 6); 55 (1 to 6); 56 (1 to 6); 57 (1 to 6); 58 (1 to 6); 59 (1 to 6); 61 (1 to 6)
National Digital Preservation Program, China
1997-2024
Preserved
2025-12-04
Preserved : 4 (1 to 6); 5 (1 to 6); 6 (1 to 6); 34 (2 to 5); 35 (1 to 6); 36 (1 to 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 6); 55 (1 to 6); 56 (1 to 6); 57 (1 to 6); 58 (1 to 6); 59 (1 to 6); 61 (1 to 6)
National Library of the Netherlands
1997-2019
Preserved
2024-12-15
Preserved : 34 (3, 5, 6); 35 (1); 36 (2-4); 37 (5, 6); 38 (1, 2, 4, 5); 39 (3, 4, 6); 40 (3, 4); 44 (5, 6); 45 (1-6); 46 (1-6); 47 (1-6); 48 (1-6); 49 (1-6); 50 (1-6); 51 (1-6); 52 (1-6); 53 (1-6); 54 (1-6); 55 (1-6); 56 (1-5)