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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 to 6); 2 (1 to 6); 3 (1 to 6); 4 (1 to 6); 5 (1 to 6); 6 (1 to 6); 7 (1 to 6); 8 (1 to 6); 9 (1 to 6); 10 (1 to 12); 11 (1 to 12); 12 (1 to 12); 13 (1 to 12); 14 (1 to 12); 15 (1 to 12); 16 (1 to 12); 17 (1 to 12); 18 (1 to 12); 19 (1 to 12); 20 (1 to 12); 21 (1 to 12); 22 (1 to 12); 23 (1 to 12); 24 (1 to 12); 25 (1 to 12); 26 (1 to 12); 27 (1 to 12); 28 (1 to 12); 29 (1 to 12); 30 (1 to 12); 31 (1 to 12); 32 (1 to 12); 33 (1 to 12); 34 (2 to 10, 12); 35 (1 to 12); 36 (1 to 12); 37 (1 to 12); 38 (1 to 12); 39 (1 to 12); 40 (1 to 12); 41 (1 to 12); 42 (1 to 12); 43 (1 to 12); 44 (1, 2, 8 to 12); 45 (1 to 12); 46 (3 to 12); 47 (1 to 12); 48 (1 to 12); 49 (1 to 8, 10, 12); 50 (1 to 12); 51 (1 to 12); 52 (1 to 12); 53 (1 to 12); 54 (1 to 12); 55 (1 to 12); 56 (1 to 12); 57 (1 to 12); 58 (1-2, 3, 4)
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Internet Archive
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Preserved
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2025-08-08
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1 to 42
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Technische Informationsbibliothek
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Preserved
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2026-01-13
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vol.29:1-12;vol.30:1-12;vol.31:1-12;vol.32:1-12;vol.33:1-12;vol.34:1-12;vol.35:1-12;vol.36:1-12;vol.37:1-12;vol.38:1-12;vol.39:1-12;vol.40:1-12;vol.41:1-12;vol.42:1-12;vol.43:1-12;vol.44:1-12;vol.45:1-12;vol.46:1-12;vol.47:1-12;vol.48:1-12;vol.49:1-12;vol.50:1-12;vol.51:1-12;vol.52:1-12;vol.53:1-2
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Portico
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Preserved
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2026-04-09
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Preserved : 1969: 1(1-6), 1970: 2(1-6), 1971: 3(1-6), 1972: 4(1-6), 1973: 5(1-6), 1974: 6(1-6), 1975: 7(1-6), 1976: 8(1-6), 1977: 9(1-6), 1978: 10(1-12), 1979: 11(1-12), 1980: 12(1-12), 1981: 13(1-12), 1982: 14(1-12), 1983: 15(1-12), 1984: 16(1-12), 1985: 17(1-12), 1986: 18(1-12), 1987: 19(1-12), 1988: 20(1-12), 1989: 21(1-12), 1990: 22(1-12), 1991: 23(1-12), 1992: 24(1-12), 1993: 25(1-12), 1994: 26(1-12), 1995: 27(1-12), 1996: 28(1-12), 1997: 29(1-12), 1998: 30(1-12), 1999: 31(1-12), 2000: 32(1-12), 2001: 33(1-12), 2002: 34(1-12), 2003: 35(1-12), 2003/2004: 36(1-12), 2005: 37(1-12), 2006: 38(1-12), 2007: 39(1-12), 2008: 40(1-12), 2009: 41(1-12), 2010: 42(1-12), 2011: 43(1-12), 2012: 44(1-12), 2013: 45(1-12), 2014: 46(1-12), 2015: 47(1-12), 2016: 48(1-12), 2017: 49(1-12), 2018: 50(1-12), 2019: 51(1-12), 2020: 52(1-12), 2021: 53(1-12), 2022: 54(1-12), 2023: 55(1-12), 2024: 56(1-12), 2025: 57(1-12), 2026: 58(1-4)
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CLOCKSS Archive
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Preserved
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2026-04-06
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23 to 58
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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 9, 11, 12); 4 (1 to 9, 11, 12); 5 (1 to 9, 11, 12); 28 (1 to 9, 11, 12); 29 (1 to 9, 11, 12); 31 (1 to 9, 11, 12); 32 (1 to 9, 11, 12); 33 (1 to 9, 11, 12); 34 (1 to 9, 11, 12); 35 (1 to 9, 11, 12); 36 (1 to 9, 11, 12); 37 (1 to 9, 11, 12); 38 (1 to 9, 11, 12); 39 (1 to 9, 11, 12); 41 (1 to 9, 11, 12); 42 (1 to 9, 11, 12); 43 (1 to 9, 11, 12); 44 (1 to 9, 11, 12); 45 (1 to 9, 11, 12); 46 (1 to 9, 11, 12); 47 (1 to 9, 11, 12); 48 (1 to 9, 11, 12); 49 (1 to 9, 11, 12); 51 (1 to 9, 11, 12); 52 (1 to 9, 11, 12); 53 (1 to 9, 11, 12); 54 (1 to 9, 11, 12); 55 (1 to 9, 11, 12); 56 (1 to 9, 12); 57 (1 to 9, 11)
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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 9, 11, 12); 4 (1 to 9, 11, 12); 5 (1 to 9, 11, 12); 28 (1 to 9, 11, 12); 29 (1 to 9, 11, 12); 31 (1 to 9, 11, 12); 32 (1 to 9, 11, 12); 33 (1 to 9, 11, 12); 34 (1 to 9, 11, 12); 35 (1 to 9, 11, 12); 36 (1 to 9, 11, 12); 37 (1 to 9, 11, 12); 38 (1 to 9, 11, 12); 39 (1 to 9, 11, 12); 41 (1 to 9, 11, 12); 42 (1 to 9, 11, 12); 43 (1 to 9, 11, 12); 44 (1 to 9, 11, 12); 45 (1 to 9, 11, 12); 46 (1 to 9, 11, 12); 47 (1 to 9, 11, 12); 48 (1 to 9, 11, 12); 49 (1 to 9, 11, 12); 51 (1 to 9, 11, 12); 52 (1 to 9, 11, 12); 53 (1 to 9, 11, 12); 54 (1 to 9, 11, 12); 55 (1 to 9, 11, 12); 56 (1 to 9, 12); 57 (1 to 9, 11, 12)
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