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Internet Archive
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Preserved
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2026-07-13
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1 to 47
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LOCKSS Archive
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Preserved
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2026-09-14
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1 to 46
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Portico
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Preserved
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2026-09-17
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Preserved : 1967: 1(1-12), 1968: 2(1-12), 1969: 3(1-12), 1970: 4(1-12), 1971: 5(1-12), 1972: 6(1-12), 1973: 7(1-12), 1974: 8(1-12), 1975: 9(1-12), 1976: 10(1-12), 1977: 11(1-12), 1978: 12(1-12), 1979: 13(1-12), 1980: 14(1-12), 1981: 15(1-12), 1982: 16(1-12), 1983: 17(1-12), 1984: 18(1-12), 1985: 19(1-12), 1986: 20(1-12), 1987: 21(1-12), 1988: 22(1-12), 1989: 23(1-10, 10, S, 11-12), 1990: 24(1-12), 1991: 25(1-12), 1992: 26(1-12), 1993: 27(1-9, 9, S, 10-12), 1994: 28(1-5, 5, S, 6-12), 1995: 29(1-12), 1996: 30(1-12), 1997: 31(1-12), 1998: 32(1-12), 1999: 33(1-12), 2000: 34(1-12), 2001: 35(1-12), 2002: 36(1-12), 2003: 37(1-12), 2004: 38(1-12), 2005: 39(1-12), 2006: 40(1-12), 2007: 41(1-12), 2008: 42(1-12), 2009: 43(1-12), 2010: 44(1-12), 2011: 45(1-12), 2012: 46(1-4, 4, S, 5-12), 2013: 47(1-6, 9-12), 2014: 48(1-12), 2015: 49(1-12), 2016: 50(1-12), 2017: 51(1-12), 2018: 52(1-12), 2019: 53(1-12), 2020: 54(1-12), 2021: 55(1-3, 5-12), 2022: 56(1-12), 2023: 57(1-12), 2024: 58(1-12), 2025: 59(1-12), 2026: 60(1-10)
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CLOCKSS Archive
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In Progress
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2026-09-14
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26 to 38, 40, 51 to 60
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LOCKSS Archive
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In Progress
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2026-09-14
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26 to 31, 60
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CLOCKSS Archive
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Preserved
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2026-09-14
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39, 41 to 50
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LOCKSS Archive
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Preserved
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2026-09-14
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47 to 59
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Library of Congress
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Preserved
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2026-09-01
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44 (1 to 7-8, 9 to 12); 45 (1 to 7-8, 9 to 12); 46 (4_suppl, 1 to 7-8, 9 to 12); 47 (1 to 7-8, 9 to 12); 48 (1 to 12); 49 (1 to 12); 50 (1 to 12); 51 (1 to 12); 52 (9); 53 (3 to 12); 54 (1 to 12); 55 (1 to 12); 56 (1 to 12); 57 (1 to 12); 58 (1 to 12); 59 (1 to 12); 60 (1 to 8)
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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 : 1 (1-4, 7, 9-12); 2 (1-12); 3 (1-12); 4; 5 (2); 6 (8); 7 (1-12); 8 (1, 2, 4, 8, 9); 9 (2, 8, 11); 10 (3, 10); 13 (1, 5, 10); 14 (11); 15 (1, 2, 7-8); 16 (5); 17 (2, 10, 11); 18 (1); 19 (2-5, 9, 11, 12); 20 (7-8, 10, 11); 21 (4-6, 7-8, 9, 10); 22 (1-4, 6, 9); 23 (1, 3, 7-8, 12); 24 (1, 7-8, 11); 25 (7-8); 26 (4, 7-8, 9, 11); 27 (2, 7-8, 9_suppl, 11, 12); 28 (5_suppl, 6, 7-8, 12); 29 (1-6, 7-8, 9-12); 30 (6, 7-8); 31 (2-5, 7-8, 9); 32 (5, 10); 33 (11, 12); 34 (2); 35 (7-8, 9, 10); 36 (7-8, 9, 10); 37 (2-4, 6, 7-8, 9, 10, 12); 38 (1-4, 6, 7-8, 9-11); 39 (1-6, 7-8, 9-12); 40 (1-6, 7-8, 9-12); 41 (1-6, 7-8, 9-12); 42 (1-6, 7-8, 9-12); 43 (1-6, 7-8, 9-12); 44 (1-6, 7-8, 9-12); 45 (1-6, 7-8, 9-12); 46 (1-6, 7-8, 9-12); 47 (1, 3, 9-12); 48 (1-12); 49 (1-9, 11, 12); 50 (1-12); 51 (1-12); 52 (1-12); 53 (1-12)
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