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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 4); 2 (1 to 4); 3 (1 to 4); 4 (1 to 4); 5 (1 to 4); 6 (1 to 6); 7 (1 to 6); 8 (1 to 6); 9 (1 to 6); 10 (1 to 6); 11 (1 to 6); 12 (1 to 6); 13 (1 to 6); 14 (1 to 6); 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 7); 22 (1 to 8); 23 (1 to 8); 24 (1 to 8); 25 (1 to 8); 26 (1 to 8); 27 (1 to 8); 28 (1 to 8); 29 (1 to 8); 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 4); 40 (1 to 4); 41 (1 to 4); 42 (1 to 4); 43 (1 to 4); 44 (1 to 4); 45 (1 to 4); 46 (1 to 4); 47 (1 to 4); 48 (1 to 8); 49 (1 to 8); 50 (1 to 8); 51 (1 to 8); 52 (1 to 8); 53 (1 to 8); 54 (1, 2, 5 to 8); 55 (1 to 8); 56 (1 to 8); 57 (S1, 1 to 8); 58 (S1, 1 to 8); 59 (1 to 8); 60 (S2, 1 to 8); 61 (S1, 1 to 8); 62 (S1, 1 to 8); 63 (S1, 1 to 8); 64 (S1, 1 to 8); 65 (S1, 1 to 8); 66 (S1, 1 to 8); 67 (S1, 1 to 6); 68 (1)
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Internet Archive
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Preserved
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2025-08-08
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1 to 56
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Technische Informationsbibliothek
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Preserved
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2026-01-13
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vol.30:1-4;vol.31:1-4;vol.32:1-4;vol.33:1-4;vol.34:1-4;vol.35:1-4;vol.36:1-4;vol.37:1-4;vol.38:1-4;vol.39:1-4;vol.40:1-4;vol.41:1-4;vol.42:1-4;vol.43:1-4;vol.44:1-4;vol.45:1-4;vol.46:1-4;vol.47:1-4;vol.48:1-8;vol.49:1-8;vol.50:1-8;vol.51:1-8;vol.52:1-8;vol.53:1-8;vol.54:1-8;vol.55:1-8;vol.56:1-8;vol.57:1-8,S1;vol.58:1-8,S1;vol.59:1-8;vol.60:1-8,S1,sup.S2;vol.61:1-8,sup.S1;vol.62:1-8,sup.S1;vol.63:1
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Portico
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Preserved
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2026-04-16
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Preserved : 1968: 1(1-4), 1969: 2(1-4), 1970: 3(1-4), 1971: 4(1-4), 1972: 5(1-4), 1973: 6(1-6), 1974: 7(1-6), 1975: 8(1-6), 1976: 9(1-6), 1977: 10(1-6), 1978: 11(1-6), 1979: 12(1-6), 1980: 13(1-6), 1981: 14(1-6), 1982: 15(1-6), 1983: 16(1-6), 1984: 17(1-6), 1985: 18(1-6), 1986: 19(1-6), 1987: 20(1-6), 1988: 21(1-7), 1989: 22(1-8), 1990: 23(1-8), 1991: 24(1-8), 1992: 25(1-8), 1993: 26(1-8), 1994: 27(1-8), 1995: 28(1-8), 1996: 29(1-8), 1997: 30(1-4), 1997: 31(1-4), 1998: 32(1-4), 1998: 33(1-4), 1999: 34(1-4), 1999: 35(1-4), 2000: 36(1-4), 2000: 37(1-4), 2001: 38(1-4), 2001: 39(1-4), 2002: 40(1-4), 2002: 41(1-4), 2003: 42(1-4), 2003: 43(1-4), 2004: 44(1-4), 2004: 45(1-4), 2005: 46(1-4), 2005: 47(1-4), 2006: 48(1-8), 2007: 49(1-8), 2008: 50(1-8), 2009: 51(1-8), 2010: 52(1-8), 2011: 53(1-8), 2012: 54(1-8), 2013: 55(1-8), 2014: 56(1-8), 2015: 57(1, S 1, 2-8), 2016: 58(1, S 1, 2-8), 2017: 59(1-8), 2018: 60(1, S 1, 2, S2, 3-8), 2019: 61(1, S1, 2-8), 2020: 62(1, S1, 2-8), 2021: 63(1, S1, 2-8), 2022: 64(1, S1, 2, S2, 3-8), 2023: 65(1, S1, 2-8), 2024: 66(1, S1, 2-8), 2025: 67(1, S 1, 2-6), 2026: 68(1-2)
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CLOCKSS Archive
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Preserved
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2026-04-13
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24 to 68
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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 4); 5 (1 to 8); 6 (S1, 1 to 8); 29 (1 to 8); 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 4); 41 (1 to 4); 42 (1 to 4); 43 (1 to 4); 44 (1 to 4); 45 (1 to 4); 46 (1 to 4); 47 (1 to 4); 48 (1 to 8); 49 (1 to 8); 51 (1 to 8); 52 (1 to 8); 53 (1 to 8); 54 (1 to 8); 55 (1 to 8); 56 (1 to 8); 57 (S1, 1 to 8); 58 (S1, 1 to 8); 59 (1 to 8); 61 (S1, 1 to 8); 62 (S1, 1 to 8); 63 (S1, 1 to 8); 64 (S1, 1 to 8); 65 (S1, 1 to 8); 66 (S1, 1 to 8); 67 (1 to 5)
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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 4); 5 (1 to 8); 6 (S1, 1 to 8); 29 (1 to 8); 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 4); 41 (1 to 4); 42 (1 to 4); 43 (1 to 4); 44 (1 to 4); 45 (1 to 4); 46 (1 to 4); 47 (1 to 4); 48 (1 to 8); 49 (1 to 8); 51 (1 to 8); 52 (1 to 8); 53 (1 to 8); 54 (1 to 8); 55 (1 to 8); 56 (1 to 8); 57 (S1, 1 to 8); 58 (S1, 1 to 8); 59 (1 to 8); 61 (S1, 1 to 8); 62 (S1, 1 to 8); 63 (S1, 1 to 8); 64 (S1, 1 to 8); 65 (S1, 1 to 8); 66 (S1, 1 to 8); 67 (1 to 5)
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Library of Congress
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Preserved
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2025-04-07
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56 (2); 57 (1 to 8, S1); 58 (1 to 6, 8); 59 (1 to 7); 60 (1, 2, 4 to 8); 61 (1 to 8, S1); 62 (1, 3, 4, 7, 8, S1); 63 (1 to 8, S1); 64 (1 to 8, S1); 65 (1, 5 to 7, S1); 66 (3, 4)
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