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Internet Archive
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Preserved
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2025-08-08
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1 to 21
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LOCKSS Archive
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Preserved
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2026-02-09
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1 to 54
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Portico
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Preserved
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2026-02-12
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Preserved : 1971: 1(1-4), 1972: 2(1-4), 1973: 3(1-4), 1974: 4(1-4), 1975: 5(1-4), 1976: 6(1-6), 1977: 7(1-6), 1978: 8(1-6), 1979: 9(1-6), 1980: 10(1-12), 1981: 11(1-12), 1982: 12(1-12), 1983: 13(1-12), 1984: 14(1-12), 1985: 15(1-12), 1986: 16(1-12), 1987: 17(1-12), 1988: 18(1-12), 1989: 19(1-12), 1990: 20(1-12), 1991: 21(1-12), 1992: 22(1-12), 1993: 23(1-12), 1994: 24(1-12), 1995: 25(1-12), 1996: 26(1-12), 1997: 27(1-12), 1998: 28(1-12), 1999: 29(1-12), 2000: 30(1-12), 2001: 31(1-12), 2002: 32(1-12), 2003: 33(1-12), 2004: 34(1-12), 2005: 35(1-12), 2006: 36(1-12), 2007: 37(1-12), 2008: 38(1-12), 2009: 39(1-12), 2010: 40(1-12), 2011: 41(1-12), 2012: 42(1-12), 2013: 43(1-12), 2014: 44(1-12), 2015: 45(1-12), 2016: 46(1-12), 2017: 47(1-12), 2018: 48(1-12), 2019: 49(1-12), 2020: 50(1-12), 2021: 51(1-12), 2022: 52(1-12), 2023: 53(1-12), 2024: 54(1-3, 5, 7, 10-12), 2025: 55(5, 7-12), 2026: 56(1)
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CLOCKSS Archive
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Preserved
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2026-02-09
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42, 44, 47 to 49
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CLOCKSS Archive
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In Progress
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2026-02-09
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43, 45, 46, 50 to 55
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LOCKSS Archive
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In Progress
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2026-02-09
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55
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National Digital Preservation Program, China
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Preserved
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2025-12-04
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Preserved : preprint (216)
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National Digital Preservation Program, China
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Preserved
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2025-12-04
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Preserved : ; preprint (215, 216); 1 (2, 6); 5 (1 to 9, 11, 12); 14 (8); 41 (11); 45 (2, 3, 5 to 9, 11); 46 (1 to 9, 11, 12); 47 (1, 3, 8, 11, 12); 48 (1 to 9, 11, 12); 49 (1 to 6, 9, 11); 51 (1, 4, 11, 12); 52 (1 to 9)
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