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Internet Archive
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Preserved
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2025-08-08
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18 to 44
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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); 2 (1, 2); 3 (1, 2); 4 (1, 2); 5 (1, 2); 6; 7 (1, 3, 4); 8 (1 to 4); 9 (1, 2-3, 4); 10 (1 to 4); 11 (1 to 4); 12 (1 to 4); 13 (1 to 4); 14 (1 to 4); 15 (1 to 4); 16 (1, 2-3, 4); 17 (1, 2-3, 4); 18 (1 to 4); 19 (1 to 4); 20 (1, 3, 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 (1 to 4); 33 (1 to 4); 34 (1 to 4); 35 (1 to 4); 36 (1 to 4); 37 (1 to 4); 38 (1 to 4); 39 (1 to 6); 40 (1 to 6); 41 (1 to 6); 42 (1 to 6); 43 (1 to 6); 44 (1 to 6); 45 (1 to 6); 46 (1 to 6); 47 (1 to 6, 8); 48 (1 to 8); 49 (1 to 8); 50 (1 to 3, 4-5, 6-7, 8); 51 (1 to 8); 52 (1 to 8); 53 (1, 2, 3-4, 5-6, 7-8); 54 (1 to 8); 55 (1 to 6, 7-8); 56 (1, 2)
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Portico
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Preserved
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2026-04-30
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Preserved : 1967: 1(1-2), 1968: 2(1-2), 1969: 3(1-2), 1970: 4(1-2), 1971: 5(1-2)
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Portico
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Preserved
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2026-04-30
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Preserved : 1972: 6(2), 1973: 7(1, 3-4), 1974: 8(1-4), 1975: 9(1-4), 1976: 10(1-4), 1977: 11(1-4), 1978: 12(1-4), 1979: 13(1-4), 1980: 14(1-4), 1981: 15(1-4), 1982: 16(1-4), 1983/1987: 17(1-4), 1988: 18(1-4), 1989: 19(1-4), 1990: 20(1-4), 1991: 21(1-4), 1992: 22(1-4), 1993: 23(1-4), 1994: 24(1-4), 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(1-4), 2009: 39(1-6), 2010: 40(1-6), 2011: 41(1-6), 2012: 42(1-6), 2013: 43(1-6), 2014: 44(1-6), 2015: 45(1-2, 5-6), 2016: 46(1-6), 2017: 47(1-8), 2018: 48(1-8), 2019: 49(1-8), 2020: 50(1-8), 2021: 51(1-2, 6-8), 2022: 52(1-8), 2023: 53(1-8), 2024: 54(1-8), 2025: 55(1-8), 2026: 56(1-3)
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CLOCKSS Archive
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In Progress
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2026-04-27
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15 to 34, 36, 47 to 56
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LOCKSS Archive
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In Progress
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2026-04-27
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15 to 29, 55, 56
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LOCKSS Archive
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Preserved
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2026-04-27
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30 to 54
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CLOCKSS Archive
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Preserved
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2026-04-27
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35, 37 to 46
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Library of Congress
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Preserved
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2025-04-07
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40 (1 to 6); 41 (1 to 6); 42 (1 to 6); 43 (1 to 6); 44 (4_suppl, 1 to 6); 45 (1 to 6); 46 (1 to 6); 47 (1 to 8); 48 (1 to 8); 49 (1 to 8); 50 (1 to 4-5, 6-7, 8); 51 (1 to 8); 52 (1 to 8); 53 (1 to 3-4, 5-6, 7-8); 54 (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, 2); 2 (1, 2); 3 (1, 2); 4 (1, 2); 5 (1, 2); 6; 7 (1, 3, 4); 8 (1-4); 9 (1, 2-3, 4); 10 (1-4); 11 (1-4); 12 (1-4); 13 (1-4); 14 (1-4); 15 (1-4); 16 (1, 2-3, 4); 17 (1, 2-3, 4); 18 (1-4); 19 (1-4); 20 (1, 3, 4); 21 (1-4); 22 (1-4); 23 (1-4); 24 (1-4); 25 (1-4); 26 (1-4); 27 (1-4); 28 (1-4); 29 (1-4); 30 (1-4); 31 (1-4); 32 (1-4); 33 (1-4); 34 (1-4); 35 (1-4); 36 (1-4); 37 (1-4); 38 (1-4); 39 (2-6); 40 (1-6); 41 (1-5); 42 (1, 3-6); 43 (1-6); 44 (1-6); 45 (1-4, 6); 46 (1-6); 47 (1-8); 48 (1-8); 49 (1-8)
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