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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 (1‐2, 3, 4); 5 (1 to 4); 6 (1 to 4); 7 (1 to 4); 8 (1 to 4); 9 (1 to 4); 10 (1 to 4); 11 (1‐2, 3‐4); 12 (1‐2, 3‐4); 13 (1‐2, 3‐4); 14 (1‐2, 3‐4); 15 (1‐2, 3‐4); 16 (1‐2, 3‐4); 17 (1‐2, 3‐4); 18 (1‐2, 3‐4); 19 (1‐2, 3‐4); 20 (1 to 4); 21 (1 to 4); 22 (1 to 4); 23 (1 to 6); 24 (1 to 6); 25 (1 to 6); 26 (1 to 6); 27 (1 to 6); 28 (1 to 6); 29 (1 to 6); 30 (1 to 6); 31 (1 to 6); 32 (1 to 6); 33 (1 to 6); 34 (1 to 6); 35 (1 to 6); 36 (1 to 6); 37 (1 to 6); 38 (1 to 6); 39 (1 to 6); 40 (1 to 6); 41 (1 to 6); 42 (1 to 6); 43 (1 to 6); 44 (3 to 6); 45 (1 to 6); 46 (1 to 6); 47 (s1, 1 to 5); 48 (1 to 6); 49 (1 to 6); 50 (1 to 6); 51 (1 to 6); 52 (1 to 6); 53 (1 to 6); 54 (1 to 6); 55 (1 to 6); 56 (1 to 7); 57 (1 to 7); 58 (1 to 7); 59 (1 to 7); 60 (1 to 7); 61 (2 to 7); 62 (1 to 7); 63 (1 to 7); 64 (1 to 7); 65 (1 to 7); 66 (1 to 7); 67 (1 to 7); 68 (1 to 7); 69 (1 to 7); 70 (1 to 7); 71 (1 to 7); 72 (1 to 7); 73 (1, 2)
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Internet Archive
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Preserved
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2025-08-08
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27 to 52
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Technische Informationsbibliothek
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Preserved
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2026-01-13
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vol.44:1-6;vol.45:1-6;vol.46:1-6;vol.47:1-6,sup.s1;vol.48:1-6;vol.49:1-6;vol.50:1-6;vol.51:1-6;vol.52:1-6;vol.53:1-6;vol.54:1-6;vol.55:1-6;vol.56:1-7;vol.57:1-7;vol.58:1-7;vol.59:1-7;vol.60:1-7;vol.61:1-7;vol.62:1-7;vol.63:1-7;vol.64:1-7;vol.65:1-7;vol.66:1-7;vol.67:1-7;vol.68:1
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Portico
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Preserved
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2026-04-16
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Preserved : 1962: 1(1-4), 1963: 2(1-4), 1964: 3(1-4), 1965: 4(1-4), 1965: 5(1-4), 1966: 6(1-4), 1966: 7(1-4), 1967: 8(1-4), 1967: 9(1-4), 1968: 10(1-4), 1968: 11(1-4), 1969: 12(1-4), 1969: 13(1-4), 1970: 14(1-4), 1970: 15(1-2), 1971: 16(1-4), 1971: 17(1-4), 1972: 18(1-4), 1972: 19(1-4), 1973: 20(1-4), 1974: 21(1-4), 1975: 22(1-4), 1976: 23(1-6), 1977: 24(1-6), 1978: 25(1-6), 1979: 26(1-6), 1980: 27(1-6), 1981: 28(1-6), 1982: 29(1-6), 1983: 30(1-6), 1984: 31(1-6), 1985: 32(1-6), 1986: 33(1-6), 1987: 34(1-6), 1988: 35(1-6), 1989: 36(1-6), 1990: 37(1-6), 1991: 38(1-6), 1992: 39(1-6), 1993: 40(1-6), 1994: 41(1-6), 1995: 42(1-6), 1996: 43(1-6), 1997: 44(1-6), 1998: 45(1-6), 1999: 46(1-6), 2000: 47(1-6), 2001: 48(1-6), 2002: 49(1-6), 2003: 50(1-6), 2004: 51(1-6), 2005: 52(1-6), 2006: 53(1-6), 2007: 54(1-6), 2008: 55(1-6), 2009: 56(1-7), 2010: 57(1-7), 2011: 58(1-7), 2012: 59(1-7), 2013: 60(1-7), 2014: 61(1-7), 2015: 62(1-7), 2016: 63(1-7), 2017: 64(1-7), 2018: 65(1-7), 2019: 66(1-7), 2020: 67(1-7), 2021: 68(1-7), 2022: 69(1-7), 2023: 70(1-7), 2024: 71(1-7), 2025: 72(1, 3-7), 2026: 73(1-2)
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CLOCKSS Archive
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Preserved
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2026-04-13
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20, 33, 38 to 73
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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 : 53 (1-6); 54 (1-6)
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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 : 5 (1 to 6); 6 (1 to 7); 7 (1 to 7); 44 (1 to 6); 45 (1 to 6); 46 (1 to 6); 47 (, 1 to 6); 48 (1 to 6); 49 (1 to 6); 51 (1 to 6); 52 (1 to 6); 53 (1 to 6); 54 (1 to 6); 55 (1 to 6); 56 (1 to 7); 57 (1 to 7); 58 (1 to 7); 59 (1 to 7); 61 (1 to 7); 62 (1 to 7); 63 (1 to 7); 64 (1 to 7); 65 (1 to 7); 66 (1 to 7); 67 (1 to 7); 68 (1 to 7); 69 (1 to 7); 71 (1 to 3, 5 to 7); 72 (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 : 5 (1 to 6); 6 (1 to 7); 7 (1 to 7); 44 (1 to 6); 45 (1 to 6); 46 (1 to 6); 47 (, 1 to 6); 48 (1 to 6); 49 (1 to 6); 51 (1 to 6); 52 (1 to 6); 53 (1 to 6); 54 (1 to 6); 55 (1 to 6); 56 (1 to 7); 57 (1 to 7); 58 (1 to 7); 59 (1 to 7); 61 (1 to 7); 62 (1 to 7); 63 (1 to 7); 64 (1 to 7); 65 (1 to 7); 66 (1 to 7); 67 (1 to 7); 68 (1 to 7); 69 (1 to 7); 71 (1 to 3, 5 to 7); 72 (1 to 6)
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