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Scholars Portal
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Preserved
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2026-03-19
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Preserved : 1 (2); 2 (1, 2); 3 (1 to 3); 4 (1, 2); 5 (1); 6 (2); 7 (1 to 4); 8 (1 to 4); 9 (1 to 4); 10 (1 to 4); 11 (1 to 4); 12 (1 to 4); 13 (1 to 4); 14 (1 to 4); 15 (1 to 6); 16 (1 to 6); 17 (1 to 6); 18 (1 to 6); 19 (1 to 6); 20 (1 to 6); 21 (1 to 6); 22 (1 to 6); 23 (1 to 6); 24 (1 to 6); 25 (1 to 6); 27 (5); 29 (4 to 6); 30 (1 to 6); 31 (1 to 5); 33 (1 to 6); 34 (1 to 6); 35 (1 to 8); 36 (1 to 8); 37 (1 to 8); 38 (1 to 8); 39 (s1, 1 to 8); 40 (1 to 6); 41 (1, 4 to 8); 42 (1 to 8); 43 (1 to 8); 44 (S1, 1 to 8); 45 (S1, 1 to 8); 46 (1 to 8); 47 (S1, 1 to 8); 48 (S2, 1 to 8); 49 (S1, 1 to 8); 50 (S1, 1 to 8); 51 (S1, 1 to 8); 52 (1 to 8); 53 (1 to 8); 54 (1 to 8); 55 (1, 2)
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Internet Archive
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Preserved
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2025-08-08
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7 to 9
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Portico
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Preserved
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2026-04-02
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Preserved : 1971/1972: 1(1-2), 1973: 2(1-2), 1974: 3(1-3), 1975: 4(1-2), 1976: 5(1), 1977: 6(1-2), 1978: 7(1-4), 1979: 8(1-4), 1980: 9(1-4), 1981: 10(1-4), 1982: 11(1-4), 1983: 12(1-4), 1984: 13(1-4), 1985: 14(1-4), 1986: 15(1-6), 1987: 16(1-6), 1988: 17(1-6), 1989/1990: 18(1-6), 1990: 19(1-6), 1991: 20(1-6), 1992: 21(1-6), 1993: 22(1-6), 1994: 23(1-6), 1995: 24(1-6), 1996: 25(1-6), 1997: 26(1-6), 1998: 27(1-6), 1999: 28(1-6), 2000: 29(1-6), 2001: 30(1-6), 2002: 31(1-6), 2003: 32(1-6), 2004: 33(1-6), 2005: 34(1-6), 2006: 35(1-6), 2007: 36(1-6), 2008: 37(1-6), 2009: 38(1-6), 2010: 39(1-6), 2011: 40(1-8), 2012: 41(1-8), 2013: 42(1-8), 2014: 43(1-8), 2015: 44(1, S 1, 2-8), 2016: 45(1, S 1, 2-8), 2017: 46(1-8), 2018: 47(1, S 1, 2-8), 2019: 48(1, S 1, 2, S2, 3-8), 2020: 49(1, S1, 2, S2, 3-8), 2021: 50(1, S1, 2-8), 2022: 51(1, S1, 2-8), 2023: 52(1-8), 2024: 53(1-8), 2025: 54(1-8), 2026: 55(1-2)
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CLOCKSS Archive
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Preserved
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2026-03-30
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15, 20 to 55
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Technische Informationsbibliothek
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Preserved
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2026-01-13
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vol.26:1-6;vol.27:1-6;vol.28:1-6;vol.29:1-6;vol.30:1-6;vol.31:1-6;vol.32:1-6;vol.33:1-6;vol.34:1-6;vol.35:1-8;vol.36:1-8;vol.37:1-8;vol.38:1-8;vol.39:1-8,sup.s1;vol.40:1-8;vol.41:1-8;vol.42:1-8;vol.43:1-8;vol.44:1-8,S1;vol.45:1-8,S1;vol.46:1-8;vol.47:1-8,S1;vol.48:1-8,S1,sup.S2;vol.49:1-8,sup.S1,sup.S2;vol.50:1
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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 6); 4 (1 to 8); 5 (S1, 1 to 8); 26 (1 to 6); 27 (1 to 6); 28 (1 to 6); 29 (1 to 6); 31 (1 to 6); 32 (1 to 6); 33 (1 to 6); 34 (1 to 6); 35 (1 to 8); 36 (1 to 8); 37 (1 to 8); 38 (1 to 8); 39 (, 1 to 8); 41 (1 to 8); 42 (1 to 8); 43 (1 to 8); 44 (S1, 1 to 8); 45 (S1, 1 to 8); 46 (1 to 8); 47 (S1, 1 to 8); 48 (S1, 1, 2, 4 to 8); 49 (S1, 1 to 8); 51 (S1, 1 to 8); 52 (1 to 8); 53 (1 to 8); 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 6); 4 (1 to 8); 5 (S1, 1 to 8); 26 (1 to 6); 27 (1 to 6); 28 (1 to 6); 29 (1 to 6); 31 (1 to 6); 32 (1 to 6); 33 (1 to 6); 34 (1 to 6); 35 (1 to 8); 36 (1 to 8); 37 (1 to 8); 38 (1 to 8); 39 (, 1 to 8); 41 (1 to 8); 42 (1 to 8); 43 (1 to 8); 44 (S1, 1 to 8); 45 (S1, 1 to 8); 46 (1 to 8); 47 (S1, 1 to 8); 48 (S1, 1, 2, 4 to 8); 49 (S1, 1 to 8); 51 (S1, 1 to 8); 52 (1 to 8); 53 (1 to 8); 54 (1 to 7)
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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 : 35 (1-8); 36 (1-8)
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