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Scholars Portal
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Preserved
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2025-09-02
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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 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 4); 19 (, 1 to 4); 20 (, 1 to 4); 21 (, 1 to 4); 22 (, 1 to 4); 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 4); 34 (, 1 to 4); 35 (, 1 to 4); 36 (, 1 to 4); 37 (, 1 to 4); 38 (, 1, 2-3, 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 4); 49 (, 1 to 4); 50 (, 1 to 4); 51 (, 1 to 4); 52 (, 1 to 4); 53 (, 1 to 4); 54 (, 1 to 4); 55 (, 1 to 12); 1970; 1971; 1972; 1973; 1974; 1975; 1976; 1977; 1978; 1979; 1980; 1981; 1982; 1983; 1984; 1985; 1986; 1987; 1988; 1989; 1990; 1991; 1992; 1993; 1994; 1995; 1996; 1997; 1998; 1999
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CLOCKSS Archive
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Preserved
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2026-02-09
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1 to 55
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Portico
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Preserved
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2026-02-12
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Preserved : 1970: 1(1-6), 1971: 2(1-6), 1972: 3(1-6), 1973: 4(1-6), 1974: 5(1-6), 1975: 6(1-6), 1976: 7(1-6), 1977: 8(1-6), 1978: 9(1-6), 1979: 10(1-6), 1980: 11(1-6), 1981: 12(1-6), 1982: 13(1-6), 1983: 14(1-6), 1984: 15(1-6), 1985: 16(1-6), 1986: 17(1-6), 1987: 18(1-4), 1987: 19(1-4), 1987: 20(1-4), 1987: 21(1-4), 1988: 22(1-4), 1988: 23(1-4), 1988: 24(1-4), 1989: 25(1-4), 1989: 26(1-4), 1989: 27(1-4), 1990: 28(1-4), 1990: 29(1-4), 1990: 30(1-4), 1991: 31(1-4), 1991: 32(1-4), 1991: 33(1-4), 1992: 34(1-4), 1992: 35(1-4), 1992: 36(1-4), 1993: 37(1-4), 1993: 38(1-4), 1993: 39(1-4), 1994: 40(1-4), 1994: 41(1-4), 1994: 42(1-4), 1995: 43(1-4), 1995: 44(1-4), 1995: 45(1-4), 1996: 46(1-4), 1996: 47(1-4), 1996: 48(1-4), 1997: 49(1-4), 1997: 50(1-4), 1997: 51(1-4), 1998: 52(1-4), 1998: 53(1-4), 1998: 54(1-4), 1999: 55(1-12)
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Technische Informationsbibliothek
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Preserved
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2026-01-13
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vol.49:1-4;vol.50:1-4;vol.51:1-4;vol.52:1-4;vol.53:1-4;vol.54:1-4;vol.55:1-12
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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 4); 49 (1 to 4); 51 (1 to 4); 52 (1 to 4); 53 (1 to 4); 54 (1 to 4); 55 (1 to 9, 11, 12)
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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 4); 49 (1 to 4); 51 (1 to 4); 52 (1 to 4); 53 (1 to 4); 54 (1 to 4); 55 (1 to 9, 11, 12)
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