Internet Archive
1971-2014
Preserved
2025-08-08
1 to 44
Scholars Portal
1971-2026
Preserved
2026-03-19
Preserved : 1 (2 to 4); 2 (1 to 4); 3 (1 to 4); 4 (1 to 4); 5 (1 to 4); 6 (1 to 4); 7 (1 to 6); 8 (1 to 6); 9 (1 to 12); 10 (1 to 12); 11 (1 to 12); 12 (1 to 12); 13 (2 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 11); 20 (S1, 1 to 10, 12); 21 (1 to 12); 22 (1 to 12); 23 (1 to 12); 24 (1 to 12); 25 (S4, 1 to 12); 26; 27 (1 to 12); 28 (1 to 15); 29 (1 to 15); 30 (1 to 15); 31 (1 to 15); 32 (2 to 11, 13 to 15); 33 (1 to 15); 34 (1 to 15); 35 (1 to 15); 36 (1 to 10, 11-12, 13 to 15); 37 (1 to 15); 38 (1 to 15); 39 (1 to 8, 10 to 18); 40 (1 to 9, 11, 12); 41 (1 to 12); 42 (1, 6 to 10, 12); 43 (1 to 12); 44 (1 to 12); 45 (1 to 12); 46 (1 to 12); 47 (1 to 12); 48 (1 to 12); 49 (1 to 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 4)
Portico
1971-2026
Preserved
2026-04-23
Preserved : 1971: 1(1-4), 1972: 2(1-4), 1973: 3(1-4), 1974: 4(1-4), 1975: 5(1-4), 1976: 6(1-4), 1977: 7(1-6), 1978: 8(1-6), 1979: 9(1-12), 1980: 10(1-12), 1981: 11(1-12), 1982: 12(1-12), 1983: 13(2-12), 1984: 14(1-12), 1985: 15(1-12), 1986: 16(1-12), 1987: 17(1-12), 1988: 18(1-12), 1989: 19(1-11), 1990: 20(1, S 1, 2, S 2, 3-10, 12), 1991: 21(1-12), 1992: 22(1-12), 1993: 23(1-12), 1994: 24(1-12), 1995: 25(1-4, S 4, 5-12), 1996: 26(1-12), 1997: 27(1-12), 1998: 28(1-15), 1999: 29(1-15), 2000: 30(1-15), 2001: 31(1-15), 2002: 32(1-15), 2003: 33(1-15), 2004: 34(1-15), 2005: 35(1-15), 2006: 36(1-15), 2007: 37(1-15), 2008: 38(1-15), 2009: 39(1-18), 2010: 40(1-12), 2011: 41(1-12), 2012: 42(1-12), 2013: 43(1-12), 2014: 44(1-12), 2015: 45(1-12), 2016: 46(1-12), 2017: 47(1-12), 2018: 48(1-12), 2019: 49(1-12), 2020: 50(1-12), 2021: 51(1-12), 2022: 52(1-12), 2023: 53(1-12), 2024: 54(1-12), 2025: 55(1-12), 2026: 56(1-3)
CLOCKSS Archive
1973-2026
Preserved
2026-04-13
3, 16, 21 to 56
Technische Informationsbibliothek
1997-2021
Preserved
2026-01-13
vol.27:1-12;vol.28:1-15;vol.29:1-15;vol.30:1-15;vol.31:1-15;vol.32:1-15;vol.33:1-15;vol.34:1-15;vol.35:1-15;vol.36:1-10,13-15,11-12;vol.37:1-15;vol.38:1-15;vol.39:1-18;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.51:1-2
National Digital Preservation Program, China
1996-2025
Preserved
2025-10-23
Preserved : 3 (2 to 9, 11 to 15); 4 (1 to 9, 11, 12); 5 (1 to 9, 11, 12); 26 (1 to 9, 11, 12); 27 (1 to 9, 11, 12); 28 (1 to 9, 11 to 15); 29 (1 to 9, 11 to 15); 31 (1 to 9, 11 to 15); 32 (1 to 9, 11 to 15); 33 (1 to 9, 11 to 15); 34 (1 to 9, 11 to 15); 35 (1 to 9, 11 to 15); 36 (1 to 9, 11?12, 13 to 15); 37 (1 to 9, 11 to 15); 38 (1 to 9, 11 to 15); 39 (1 to 9, 11 to 18); 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, 3 to 9, 11, 12); 55 (1 to 9)
National Digital Preservation Program, China
1996-2025
Preserved
2025-12-04
Preserved : 3 (2 to 9, 11 to 15); 4 (1 to 9, 11, 12); 5 (1 to 9, 11, 12); 26 (1 to 9, 11, 12); 27 (1 to 9, 11, 12); 28 (1 to 9, 11 to 15); 29 (1 to 9, 11 to 15); 31 (1 to 9, 11 to 15); 32 (1 to 9, 11 to 15); 33 (1 to 9, 11 to 15); 34 (1 to 9, 11 to 15); 35 (1 to 9, 11 to 15); 36 (1 to 9, 11?12, 13 to 15); 37 (1 to 9, 11 to 15); 38 (1 to 9, 11 to 15); 39 (1 to 9, 11 to 18); 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, 3 to 9, 11, 12); 55 (1 to 9, 11)