Scholars Portal
1967-2026
Preserved
2026-03-19
Preserved : 1 (2); 2 (1, 2); 3 (1, 2); 4 (1, 2); 5 (1, 2); 6 (1 to 4); 7 (1 to 4); 8 (1 to 4); 9 (1 to 4); 10 (1 to 4); 11 (1-2, 3, 4); 13 (1 to 4); 14 (1-2, 3, 4); 15 (1-2, 3, 4); 16 (1 to 4); 17 (1 to 4); 18 (1 to 4); 19 (1 to 4); 20 (1 to 4); 21 (1 to 4); 22 (1 to 4); 23 (1 to 4); 24 (1 to 4); 25 (1 to 4); 26 (1 to 4); 27 (1 to 4); 28 (1 to 4); 29 (1 to 4); 30 (1 to 4); 31 (1 to 4); 32 (sup1, 1 to 4); 33 (1 to 4); 34 (1 to 4); 35 (sup1, 1 to 4); 36 (sup2, 1 to 4); 37 (1 to 4); 38 (sup3, 1 to 4); 39 (sup4, 1 to 4); 40 (sup5, 1 to 4); 41 (1 to 4); 42 (sup6, 1 to 4); 43 (sup1, 1 to 4); 44 (1 to 5); 45 (1 to 5); 46 (1 to 5); 47 (1 to 5); 48 (1 to 5); 49 (1 to 5); 50 (1 to 5); 51 (1 to 5); 52 (1 to 5); 53 (1 to 5); 54 (1 to 5); 55 (1 to 5); 56 (2 to 5); 57 (1 to 5); 58 (1)
Internet Archive
1967-2014
Preserved
2025-08-08
1 to 46
CLOCKSS Archive
1981-2024
Preserved
2026-04-06
ahead-of-print, 13 to 57
LOCKSS Archive
1981-2024
Preserved
2026-04-06
13 to 56
LOCKSS Archive
2025-2026
In Progress
2026-04-06
57, 58
Portico
2007-2026
Preserved
2026-04-02
Preserved : 1968/2007: 1(1-2), 1968/1969: 2(1-2), 1970/1971: 3(1-2), 1971: 4(1-2), 1972: 5(1-2), 1974: 6(1-4), 1975: 7(1-4), 1976: 8(1-4), 1977: 9(1-4), 1978: 10(1-4), 1979: 11(1-4), 1980: 12(1-4), 1981: 13(1-4), 1982: 14(1-4), 1983: 15(1-4), 1984: 16(1-4), 1985: 17(1-4), 1986: 18(1-4), 1987: 19(1-4), 1988: 20(1-4), 1989: 21(1-4), 1990: 22(1-4), 1991: 23(1-4), 1992: 24(1-4), 1993: 25(1-4), 1994: 26(1-4), 1995: 27(1-4), 1996: 28(1-4), 1997: 29(1-4), 1998: 30(1-4), 1999: 31(1-4), 2000: 32(1-4), 2001: 33(1-4), 2002: 34(1-4), 2003: 35(1-4), 2004: 36(1-4), 2005: 37(1-4), 2006: 38(1-4), 2007: 39(1-4), 2008: 40(1-sup5), 2009: 41(1-4), 2010: 42(1-4, sup6), 2011: 43(1-4), 2012: 44(1-5), 2013: 45(1-5), 2014: 46(1-5), 2015: 47(1-5), 2016: 48(1-5), 2017: 49(1-5), 2018: 50(1-5), 2019: 51(1-5), 2020: 52(1-5), 2021: 53(1-5), 2022: 54(1-5), 2023: 55(1-5), 2024: 56(1-3, 5), 2025: 57(1-5), 2026: 58(1)
National Digital Preservation Program, China
1997-2025
Preserved
2025-12-04
Preserved : 3 (1 to 4); 4 (sup5, 1 to 4); 5 (1 to 5); 29 (1 to 4); 31 (1 to 4); 32 (sup1, 1 to 4); 33 (1 to 4); 34 (1 to 4); 35 (sup1, 1 to 4); 36 (sup2, 1 to 4); 37 (1 to 4); 38 (sup3, 1 to 4); 39 (sup4, 1 to 4); 41 (1 to 4); 42 (sup6, 1 to 4); 43 (sup1, 1 to 4); 44 (1 to 5); 45 (1 to 5); 46 (1 to 5); 47 (1 to 5); 48 (1 to 5); 49 (1 to 5); 51 (1 to 5); 52 (1 to 5); 53 (1 to 5); 54 (1 to 5); 55 (1 to 5); 56 (1 to 5); 57 (1)
Library of Congress
2017-2024
Preserved
2025-04-07
49 (2 to 5); 50 (1 to 5); 51 (1 to 5); 52 (1 to 5); 53 (1 to 5); 54 (1 to 5); 55 (1 to 5); 56 (1 to 5)