Portico
1985-1989
Preserved
2026-02-12
Preserved : 1985: 1(1-4), 1986: 2(1-4), 1987: 3(1-4), 1988: 4(1-4), 1989: 5(1-4)
Scholars Portal
0000-2025
Preserved
2025-09-02
Preserved : 6 (1 to 4); 7 (, 1 to 6); 8 (, 1 to 6); 9 (, 1 to 6); 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 7, 8-9); 17 (, 1 to 9); 18 (, 1 to 9); 19 (, 1 to 9); 20 (, 1 to 9); 21 (, 1 to 6, 8-9); 22 (, 1 to 12); 23 (, 1 to 12); 24 (, 1 to 12); 25 (, 1 to 12); 26 (, 1 to 12); 27 (, 1 to 12); 28 (, 1 to 12); 29 (, 1 to 12); 30 (, 1 to 12); 31 (, 1 to 12); 32 (, 1 to 12); 33 (, 1 to 12); 34 (, 1 to 12); 35 (, 1 to 12); 36 (, 1 to 12); 37 (, 1 to 12); 38 (, 1 to 12); 39 (, 1 to 12); 40 (, 1 to 12); 41 (, 1 to 7); 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
Internet Archive
1985-2015
Preserved
2025-08-08
1 to 31
CLOCKSS Archive
1966-2026
Preserved
2026-02-09
1 to 42
Portico
1990-2025
Preserved
2026-02-12
Preserved : 1990: 6(1-4), 1991: 7(1-6), 1992: 8(1, S 1, 2-6), 1993: 9(1-6), 1994: 10(1-6), 1995: 11(1-6), 1996: 12(1-6), 1997: 13(1-6), 1997/1998: 14(1-6), 1999: 15(1-6), 2000: 16(1-9), 2001: 17(1-9), 2002: 18(1-9), 2003: 19(1-9), 2004: 20(1-9), 2005: 21(1-9), 2006: 22(1-12), 2007: 23(1-12), 2008: 24(1-12), 2009: 25(1-12), 2010: 26(1-12), 2011: 27(1-12), 2012: 28(1-11), 2013: 29(1-9, 12), 2014: 30(1-12), 2015: 31(3-12), 2016: 32(1-12), 2017: 33(1-12), 2018: 34(1-12), 2019: 35(1-12), 2020: 36(1-12), 2021: 37(1-12), 2022: 38(1-12), 2023: 39(1-12), 2024: 40(1-12), 2025: 41(2-12), 2025: 42(1)
LOCKSS Archive
2012-2019
In Progress
2026-02-09
28, 35
LOCKSS Archive
2013-2018
Preserved
2026-02-09
29 to 34
Library of Congress
2018-2025
Preserved
2025-04-07
34 (1 to 12); 35 (1 to 12); 36 (1 to 12); 37 (1 to 12); 38 (1 to 12); 39 (1 to 12); 40 (1 to 11); 41 (2)
National Digital Preservation Program, China
1997-2024
Preserved
2025-10-23
Preserved : 2 (1 to 9); 3 (1 to 9, 11, 12); 4 (1 to 9, 11, 12); 13 (1 to 6); 14 (1 to 6); 15 (1 to 6); 16 (1 to 8); 17 (1 to 9); 18 (1 to 9); 19 (1 to 9); 21 (1 to 6, 8); 22 (1 to 9, 11, 12); 23 (1 to 9, 11, 12); 24 (1 to 9, 11, 12); 25 (1 to 9, 11, 12); 26 (1 to 9, 11, 12); 27 (1 to 9, 11, 12); 28 (1 to 9, 11, 12); 29 (1 to 9, 11, 12); 31 (1 to 9, 11, 12); 32 (1 to 9, 11, 12); 33 (1 to 9, 11, 12); 34 (1 to 9, 11, 12); 35 (1 to 9, 11, 12); 36 (1 to 9, 11, 12); 37 (1 to 9, 11, 12); 38 (1 to 9, 11, 12); 39 (1 to 9, 11, 12)
National Digital Preservation Program, China
1997-2024
Preserved
2025-12-04
Preserved : 2 (1 to 9); 3 (1 to 9, 11, 12); 4 (1 to 9, 11, 12); 13 (1 to 6); 14 (1 to 6); 15 (1 to 6); 16 (1 to 8); 17 (1 to 9); 18 (1 to 9); 19 (1 to 9); 21 (1 to 6, 8); 22 (1 to 9, 11, 12); 23 (1 to 9, 11, 12); 24 (1 to 9, 11, 12); 25 (1 to 9, 11, 12); 26 (1 to 9, 11, 12); 27 (1 to 9, 11, 12); 28 (1 to 9, 11, 12); 29 (1 to 9, 11, 12); 31 (1 to 9, 11, 12); 32 (1 to 9, 11, 12); 33 (1 to 9, 11, 12); 34 (1 to 9, 11, 12); 35 (1 to 9, 11, 12); 36 (1 to 9, 11, 12); 37 (1 to 9, 11, 12); 38 (1 to 9, 11, 12); 39 (1 to 9, 11, 12)
National Library of the Netherlands
1997-2019
Preserved
2024-12-15
Preserved : 13 (5, 6); 14 (1-6); 15 (3); 17 (1, 2, 6, 8, 9); 18 (1, 4, 6, 8); 19 (3, 8, 9); 20 (3-5, 7); 21 (3-5, 6-7, 8-9); 22 (1, 3-7, 9, 11, 12); 23 (1-3, 6-12); 24 (1-12); 25 (1-12); 26 (1-12); 27 (1-12); 28 (1-12); 29 (1-9, 11, 12); 30 (1-5, 7, 12); 31 (3, 5-7, 10); 32 (1, 2, 7, 12); 33 (2-5, 7, 8, 10, 12); 34 (1, 3, 4, 6-8, 11, 12); 35 (1, 5, 6, 8-10)