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Scholars Portal
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Preserved
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2026-03-19
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Preserved : 1 (1); 2; 3; 4; 5; 6; 7; 8; 9; 10; 11; 12; 13; 14; 15; 16; 17; 18; 19; 20; 21; 22; 23; 24; 25 (2 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 (1 to 4); 33 (1 to 4); 34 (1 to 4); 35 (1, 2-3, 4); 36 (1-2, 3, 4); 37 (1 to 4); 38 (1 to 5); 39 (1 to 5); 40 (1 to 5); 41 (1 to 5); 42 (1 to 6); 43 (1 to 6); 44 (1 to 6); 45 (1 to 6); 46 (1 to 6); 47 (1 to 6); 48 (1 to 6); 49 (1 to 6); 50 (1 to 6); 51 (Suppl, 1 to 6); 52 (Suppl, 1 to 6); 53 (1 to 6); 54 (1, 3 to 6); 55 (1 to 6); 56 (1)
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CLOCKSS Archive
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Preserved
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2026-04-27
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1 to 56
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Portico
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Preserved
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2026-04-23
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Preserved : 1971: 1(1), 1972: 2(1), 1973: 3(1), 1974: 4(1), 1975: 5(1), 1976: 6(1), 1977: 7(1), 1978: 8(1), 1979: 9(1), 1980: 10(1), 1981: 11(1), 1982: 12(1), 1983: 13(1), 1984: 14(1), 1985: 15(1), 1986: 16(1), 1987: 17(1), 1988: 18(1), 1989: 19(1), 1990: 20(1), 1991: 21(1), 1992: 22(1), 1993: 23(1), 1994: 24(1), 1995: 25(1-4), 1996: 26(1-4), 1997: 27(1-4), 1998: 28(1-4), 1999: 29(1-4), 2000: 30(1-4), 2001: 31(1-4), 2002: 32(1-4), 2003: 33(1-4), 2004: 34(1-4), 2005: 35(1-4), 2006: 36(1-4), 2007: 37(1-4), 2008: 38(1-5), 2009: 39(1-5), 2010: 40(1-5), 2011: 41(1-5), 2012: 42(1-6), 2013: 43(1-6), 2014: 44(1-5), 2015: 45(2-6), 2016: 46(1-6), 2017: 47(1-6), 2018: 48(1-6), 2019: 49(1-6), 2018/2020: 50(1-6), 2021: 51(1, S 1, 2, S 2, 3-6), 2022: 52(1, S 1, 2-6), 2023: 53(2-6), 2024: 54(1-6), 2025: 55(1-6), 2026: 56(1-2)
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LOCKSS Archive
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In Progress
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2026-04-27
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42, 49
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LOCKSS Archive
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Preserved
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2026-04-27
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43 to 48
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Library of Congress
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Preserved
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2025-04-07
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46 (2); 48 (2 to 6); 49 (1 to 6); 50 (1 to 6); 51 (S1, 1, S2, 2 to 6); 52 (S1, 1 to 6); 53 (1 to 6); 54 (1 to 5)
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National Digital Preservation Program, China
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Preserved
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2025-10-23
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Preserved : 3 (1 to 4); 4 (1 to 5); 5 (1 to 6); 27 (1 to 4); 28 (1 to 4); 29 (1 to 4); 31 (1 to 4); 32 (1 to 4); 33 (1 to 4); 34 (1 to 4); 35 (1, 2, 4); 36 (1, 3, 4); 37 (1 to 4); 38 (1 to 5); 39 (1 to 5); 41 (1 to 5); 42 (1 to 6); 43 (1 to 6); 44 (1 to 6); 45 (1 to 6); 46 (1 to 6); 47 (1 to 6); 48 (1 to 6); 49 (1 to 6); 51 (Suppl 2, 1 to 6); 52 (Suppl 1, 1 to 6); 53 (1 to 6); 54 (1 to 6)
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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 : 3 (1 to 4); 4 (1 to 5); 5 (1 to 6); 27 (1 to 4); 28 (1 to 4); 29 (1 to 4); 31 (1 to 4); 32 (1 to 4); 33 (1 to 4); 34 (1 to 4); 35 (1, 2, 4); 36 (1, 3, 4); 37 (1 to 4); 38 (1 to 5); 39 (1 to 5); 41 (1 to 5); 42 (1 to 6); 43 (1 to 6); 44 (1 to 6); 45 (1 to 6); 46 (1 to 6); 47 (1 to 6); 48 (1 to 6); 49 (1 to 6); 51 (Suppl 2, 1 to 6); 52 (Suppl 1, 1 to 6); 53 (1 to 6); 54 (1 to 6)
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National Library of the Netherlands
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Preserved
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2024-12-15
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Preserved : 27 (2); 31 (1-4); 32 (1-4); 33 (1-4); 34 (1-4); 35 (1, 2-3, 4); 36 (1-2, 3, 4); 37 (1, 3, 4); 38 (1-5); 39 (1-5); 40 (1-5); 41 (1-5); 42 (1-6); 43 (1-6); 44 (1-6); 45 (1-6); 46 (1-6); 47 (1-6); 48 (1-6); 49 (1-5)
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