Scholars Portal
1968-2023
Preserved
2026-03-19
Preserved : 1 (1 to 3); 2 (1); 3; 4; 5; 6; 7; 8; 9; 10; 11; 12; 13 (2); 14 (1, 2); 15 (1, 2); 16 (1, 2); 17 (1, 2); 18 (1, 2); 19 (1, 2); 20 (1, 2); 21 (1, 2); 22 (1, 2); 23 (1, 2); 24 (1, 2); 25 (1, 2); 26 (1, 2); 27 (1, 2); 28 (1, 2); 29 (1, 2); 30 (1, 2); 31 (1, 2); 32 (1, 2); 33 (1, 2); 34 (1, 2); 35 (1, 2); 36 (1, 2); 37 (1, 2); 38 (1, 2); 39 (1, 2); 40 (1, 2); 41 (sup1, 1, 2); 42 (1, 2); 43 (1, 2); 44 (1, 2); 45 (1, 2); 46 (1, 2); 47 (1, 2); 48 (1, 2); 49 (1, 2); 50 (1, 2); 51 (1, 2); 52 (1-2); 53 (2); 54 (1, 2)
Internet Archive
1968-2006
Preserved
2025-08-08
1-25 to 37
LOCKSS Archive
2010-2012
Preserved
2026-03-30
41 to 43
CLOCKSS Archive
2010-2015
Preserved
2026-03-30
41 to 46
Portico
1968-2015
Preserved
2026-04-02
Preserved : 1968/1969/1970: 1(1-3), 1971: 2(1), 1972: 3(1), 1973: 4(1), 1974: 5(1), 1975: 6(1), 1976: 7(1), 1977: 8(1), 1978: 9(1), 1979: 10(1), 1980: 11(1), 1981: 12(1), 1982: 13(1-2), 1983: 14(1-2), 1984: 15(1-2), 1985: 16(1-2), 1986: 17(1-2), 1987: 18(1-2), 1988: 19(1-2), 1989: 20(1-2), 1990: 21(1-2), 1991: 22(1-2), 1992: 23(1-2), 1993: 24(1-2), 1994: 25(1-2), 1995: 26(1-2), 1996: 27(1-2), 1997: 28(1-2), 1998: 29(1-2), 1999: 30(1-2), 2000: 31(1-2), 2001: 32(1-2), 2002: 33(1-2), 2003: 34(1-2), 2004: 35(1-2), 2005: 36(1-2), 2006: 37(1-2), 2007: 38(1-2), 2008: 39(1-2), 2009: 40(1-2), 2010: 41(1-2), 2011: 42(1-2), 2012: 43(1-2), 2013: 44(1-2), 2014: 45(1-2), 2015: 46(1)
LOCKSS Archive
1968-2024
Preserved
2026-03-30
1 to 54
CLOCKSS Archive
1968-2025
Preserved
2026-03-30
1 to 54
Portico
2001-2023
Preserved
2026-04-02
Preserved : 2001: 32(1-2), 2002: 33(1-2), 2003: 34(1-2), 2004: 35(1-2), 2005: 36(1-2), 2006: 37(1-2), 2007: 38(1-2), 2008: 39(1-2), 2009: 40(1-2), 2010: 41(1-2), 2011: 42(1-2), 2012: 43(1-2), 2013: 44(1-2), 2014: 45(1-2), 2015: 46(1-2), 2016: 47(1-2), 2017: 48(1-2), 2018: 49(1-2), 2019: 50(1-2), 2020: 51(1-2), 2021: 52(1-2), 2022: 53(1-2), 2023: 54(1-2)
National Digital Preservation Program, China
2017-2018
Preserved
2025-12-04
Preserved : 48 (1, 2); 49 (1)
National Digital Preservation Program, China
2017-2020
Preserved
2025-12-04
Preserved : 48 (1, 2); 49 (1); 51
National Digital Preservation Program, China
1997-2023
Preserved
2025-12-04
Preserved : 3 (2); 4 (1, 2); 5 (1, 2); 28 (1, 2); 29 (1, 2); 31 (1, 2); 32 (1, 2); 33 (1, 2); 34 (1, 2); 35 (1, 2); 36 (1, 2); 37 (1, 2); 38 (1, 2); 39 (1, 2); 41 (sup1, 1, 2); 42 (1, 2); 43 (1, 2); 44 (1, 2); 45 (1, 2); 46 (1, 2); 47 (1, 2); 48 (1, 2); 49 (1, 2); 51 (1, 2); 52 (1-2); 53 (2); 54 (1)
Library of Congress
2017-2022
Preserved
2025-04-07
47 (2); 48 (1, 2); 49 (1, 2); 50 (1, 2); 51 (1, 2); 52 (1-2); 53 (1, 2)