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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); 3 (1); 4 (2); 5 (1 to 3); 6 (1 to 3); 7 (1 to 3); 8 (1 to 3); 9 (1 to 3); 10 (1, 2); 11 (3); 12 (1 to 3); 13 (1 to 3); 14 (1 to 3); 15 (1 to 3); 16 (1 to 3); 17 (1, 2‐3); 18 (1 to 3); 19 (1 to 3); 20 (1 to 3); 21 (1 to 3); 22 (1 to 3); 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 5); 34 (1 to 5); 35 (1 to 5); 36 (1 to 5); 37 (1 to 5); 38 (1 to 5); 39 (1 to 5); 40 (1 to 5); 41 (s1, 1 to 5); 42 (1 to 5); 43 (1 to 5); 44 (1 to 5); 45 (1 to 5); 46 (1 to 5); 47 (1 to 5); 48 (1 to 5); 49 (S1, 1 to 5); 50 (1 to 5); 51 (1 to 5); 52 (1 to 6); 53 (1 to 6); 54 (1 to 6); 55 (1 to 6); 56 (1 to 6); 57 (1 to 6); 58 (1); 1011 (3‐1)
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Internet Archive
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Preserved
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2025-08-08
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2 to 40
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Technische Informationsbibliothek
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Preserved
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2026-01-13
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vol.29:1-4;vol.30:1-4;vol.31:1-4;vol.32:1-4;vol.33:1-5;vol.34:1-5;vol.35:1-5;vol.36:1-5;vol.37:1-5;vol.38:1-5;vol.39:1-5;vol.40:1-5;vol.41:1-5,sup.s1;vol.42:1-5;vol.43:1-5;vol.44:1-5;vol.45:1-5;vol.46:1-5;vol.47:1-5;vol.48:1-5;vol.49:1-5,sup.S1;vol.50:1-5;vol.51:1-5;vol.52:1-6
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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), 1970: 2(1-2), 1971: 3(1), 1972: 4(1-2), 1973: 5(1-3), 1974: 6(1-3), 1975: 7(1-3), 1976: 8(1-3), 1977: 9(1-3), 1978: 10‐11(3), 1978: 10(1-2)
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CLOCKSS Archive
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Preserved
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2026-04-06
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4 to 6, 10‐11, 23 to 58
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Portico
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Preserved
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2026-04-09
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Preserved : 1979: 11(2-3), 1980: 12(1-3), 1981: 13(1-3), 1982: 14(1-3), 1983: 15(1-3), 1984: 16(1-3), 1985: 17(1-3), 1986: 18(1-3), 1987: 19(1-3), 1988: 20(1-3), 1989: 21(1-3), 1990: 22(1-3), 1991: 23(1-4), 1992: 24(1-4), 1993: 25(1-4), 1994: 26(1-4), 1995: 27(1-4), 1996: 28(1-4), 1997: 29(1-4), 1998: 30(1-4), 1999: 31(1-4), 2000: 32(1-4), 2001: 33(1-5), 2002: 34(1-5), 2003: 35(1-5), 2004: 36(1-5), 2005: 37(1-5), 2006: 38(1-5), 2007: 39(1-5), 2008: 40(1-5), 2009: 41(1-5), 2010: 42(1-5), 2011: 43(1-5), 2012: 44(1-5), 2013: 45(1-5), 2014: 46(1-5), 2015: 47(1-5), 2016: 48(1-5), 2017: 49(1, S1, 2-5), 2018: 50(1-5), 2019: 51(1-5), 2020: 52(1-6), 2021: 53(1-6), 2022: 54(1-6), 2023: 55(1-6), 2024: 56(1-6), 2025: 57(1-6), 2026: 58(1-2)
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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 : 38 (1-5); 39 (1-4)
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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 5); 5 (1 to 5); 29 (1 to 4); 31 (1 to 4); 32 (1 to 4); 33 (1 to 5); 34 (1 to 5); 35 (1 to 5); 36 (1 to 5); 37 (1 to 5); 38 (1 to 5); 39 (1 to 5); 41 (, 1 to 5); 42 (1 to 5); 43 (1 to 5); 44 (1 to 5); 45 (1 to 5); 46 (1 to 5); 47 (1 to 5); 48 (1 to 5); 49 (, 1 to 5); 51 (1 to 5); 52 (1 to 6); 53 (1 to 6); 54 (1 to 6); 55 (1 to 6); 56 (1 to 6); 57 (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 5); 5 (1 to 5); 29 (1 to 4); 31 (1 to 4); 32 (1 to 4); 33 (1 to 5); 34 (1 to 5); 35 (1 to 5); 36 (1 to 5); 37 (1 to 5); 38 (1 to 5); 39 (1 to 5); 41 (, 1 to 5); 42 (1 to 5); 43 (1 to 5); 44 (1 to 5); 45 (1 to 5); 46 (1 to 5); 47 (1 to 5); 48 (1 to 5); 49 (, 1 to 5); 51 (1 to 5); 52 (1 to 6); 53 (1 to 6); 54 (1 to 6); 55 (1 to 6); 56 (1 to 6); 57 (1 to 6)
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