Scholars Portal
1961-2026
Preserved
2026-03-19
Preserved : 1 (1, 2); 2 (1, 2); 3 (1, 2); 4 (1, 2); 5 (1, 2); 6 (1, 2); 7 (1-2); 8; 9; 10 (2, 3); 11 (1, 2); 12 (1, 2); 13 (1, 2); 14 (1, 2); 15 (1, 2); 16 (1, 2); 17 (1, 2); 18 (1, 2); 19 (1, 2); 25; 26 (1 to 3); 27 (1 to 3); 28 (1 to 3); 29 (1 to 3); 30 (1 to 3); 31 (sup1, 1 to 3); 32 (sup1, 1 to 3); 33 (1 to 3); 34 (sup1, 1 to 3); 35 (sup1, 1 to 3); 36 (1 to 3); 37 (1 to 3); 38 (1, 2-3); 39 (1, 3 to 6); 40 (1-2, 3, 4, 5-6); 41 (1-2, 3, 4-5, 6); 42 (1-2, 3, 4-5, 6); 43 (1 to 6); 44 (1-2, 3 to 6); 45 (1-2, 3, 4-5, 6); 46 (1-2, 3 to 6); 47 (1-2, 3 to 6); 48 (1, 2, 5, 6); 49 (1 to 6); 50 (1-2, 3 to 6); 51 (1-2, 3 to 6); 52 (1-2, 3 to 6); 53 (1-2, 3 to 6); 54 (1-2, 3 to 6); 55 (1 to 6); 56 (1-2, 3 to 6); 57 (1-2, 3 to 6); 58 (1 to 6); 59 (1 to 6); 60 (1 to 6); 61 (1 to 6); 62 (1)
Portico
1961-1968
Preserved
2026-04-02
Preserved : 1961: 1(1-2), 1962: 2(1-2), 1963: 3(1-2), 1964: 4(1-2), 1965: 5(1-2), 1966: 6(1-2), 1967: 7(1-2), 1968: 8(1-2)
Portico
1970-1981
Preserved
2026-04-02
Preserved : 1970: 10(1-3), 1971: 11(1-2), 1972: 12(1-2), 1973: 13(1-2), 1974: 14(1-2), 1975: 15(1-2), 1976: 16(1-2), 1977: 17(1-2), 1978: 18(1-2), 1979: 19(1-2), 1980: 20(1-2), 1981: 21(1-2)
Portico
1983-2026
Preserved
2026-04-02
Preserved : 1983: 23(1-2), 1984: 24(1-2), 1984/1985: 25(1-2), 1990: 26(1-3), 1991: 27(1-3), 1992: 28(1-3), 1993: 29(1-3), 1994: 30(1-3), 1995: 31(1-3), 1996: 32(1-3), 1997: 33(1-3), 1998: 34(1-3), 1999: 35(1-3), 2000: 36(1-3), 2001: 37(1-3), 2002: 38(1-3), 2003: 39(1, 3-6), 2004: 40(1-6), 2005: 41(1-6), 2006: 42(1-6), 2007: 43(1-6), 2008: 44(1-6), 2009: 45(1-3, 6), 2010: 46(1-6), 2011: 47(1-6), 2012: 48(1-6), 2013: 49(1-6), 2014: 50(1-6), 2015: 51(1-6), 2016: 52(1-6), 2017: 53(1-6), 2018: 54(1-6), 2019: 55(1-6), 2020: 56(1-6), 2021: 57(1-6), 2022: 58(1-6), 2023: 59(1-6), 2024: 60(1-6), 2025: 61(1-6), 2026: 62(1-2)
LOCKSS Archive
1961-2024
Preserved
2026-03-30
1 to 60
CLOCKSS Archive
1961-2025
Preserved
2026-03-30
ahead-of-print to 61
LOCKSS Archive
2025-2026
In Progress
2026-03-30
61, 62
National Digital Preservation Program, China
1997-2025
Preserved
2025-12-04
Preserved : 4 (1-2, 3, 4, 5-6); 5 (1-2, 3 to 6); 6 (1 to 6); 33 (1 to 3); 34 (sup1, 1 to 3); 35 (sup1, 1 to 3); 36 (1 to 3); 37 (1 to 3); 38 (1, 2-3); 39 (1, 3 to 6); 41 (1-2, 3, 4-5, 6); 42 (1-2, 3, 4-5, 6); 43 (1 to 6); 44 (1-2, 3 to 6); 45 (1-2, 3, 4-5, 6); 46 (1-2, 3 to 6); 47 (1-2, 3 to 6); 48 (1 to 6); 49 (1 to 6); 51 (1-2, 3 to 6); 52 (1-2, 3 to 6); 53 (1-2, 3 to 6); 54 (1-2, 3 to 6); 55 (1 to 6); 56 (1-2, 3 to 6); 57 (1-2, 3 to 6); 58 (1 to 6); 59 (1, 2, 4 to 6); 61 (1, 2)
Library of Congress
2010-2024
Preserved
2025-04-07
46 (1-2, 3 to 6); 47 (1-2, 3 to 6); 48 (1 to 6); 49 (1 to 6); 50 (1-2, 3 to 6); 51 (1-2, 3 to 6); 52 (1-2, 3 to 6); 53 (1-2, 3 to 6); 54 (1-2, 3 to 6); 55 (1 to 6); 56 (1-2, 3 to 6); 57 (1-2, 3 to 6); 58 (1 to 6); 59 (1 to 6); 60 (1 to 5)