Scholars Portal
1986-2012
Preserved
2026-03-19
Preserved : 24 (1 to 12); 25 (1 to 12); 26 (1 to 12); 27 (1 to 13); 28 (1 to 13); 29 (1 to 13); 30 (1 to 13); 31 (1 to 13); 32 (1 to 16); 33 (1 to 17); 34 (1 to 17); 35 (1 to 17); 36 (1 to 17); 37 (1 to 24); 38 (S1, 1 to 24); 39 (1 to 24); 40 (5 to 24); 41 (1 to 24); 42 (1 to 24); 43 (1 to 24); 44 (1 to 24); 45 (1 to 24); 46 (1 to 24); 47 (1 to 24); 48 (1 to 24); 49 (1 to 24); 50 (1 to 4)
Internet Archive
1966-2010
Preserved
2025-08-08
4 to 48
Portico
1986-2019
Preserved
2026-04-16
Preserved : 1986: 24(1-12), 1987: 25(1-12), 1988: 26(1-12), 1989: 27(1-13), 1990: 28(1-13), 1991: 29(1-13), 1992: 30(1-13), 1993: 31(1-13), 1994: 32(1-16), 1995: 33(1-17), 1996: 34(1-17), 1997: 35(1-17), 1998: 36(1-17), 1999: 37(1-24), 2000: 38(1, S 1, 2-24), 2001: 39(1-24), 2002: 40(1-24), 2003: 41(1-24), 2004: 42(1-24), 2005: 43(1-24), 2006: 44(1-24), 2007: 45(1-24), 2008: 46(1-24), 2009: 47(1-24), 2010: 48(1-24), 2011: 49(1-24), 2012: 50(1-24), 2013: 51(1-24), 2014: 52(1-24), 2015: 53(1-24), 2016: 54(1-24), 2017: 55(1-24), 2018: 56(1-24), 2019: 57(1-24)
CLOCKSS Archive
1991-2019
Preserved
2026-04-13
29 to 57
National Digital Preservation Program, China
1997-2019
Preserved
2025-10-23
Preserved : 4 (1 to 9, 11 to 19, 21 to 24); 5 (1 to 9, 11 to 19, 21 to 24); 35 (1 to 9, 11 to 17); 36 (1 to 9, 11 to 17); 37 (1 to 9, 11 to 19, 21 to 24); 38 (S1, 1 to 9, 11 to 19, 21 to 24); 39 (1 to 9, 11 to 19, 21 to 24); 41 (1 to 9, 11 to 19, 21 to 24); 42 (1 to 9, 11 to 19, 21 to 24); 43 (1 to 9, 11 to 19, 21 to 24); 44 (1 to 9, 11 to 19, 21 to 24); 45 (1 to 9, 11 to 19, 21 to 24); 46 (1 to 9, 11 to 19, 21 to 24); 47 (1 to 9, 11 to 19, 21 to 24); 48 (1 to 9, 11 to 19, 21 to 24); 49 (1 to 9, 11 to 19, 21 to 24); 51 (1 to 9, 11 to 19, 21 to 24); 52 (1 to 9, 11 to 19, 21 to 24); 53 (1 to 9, 11 to 19, 21 to 23); 54 (1 to 9, 11 to 19, 21 to 24); 55 (1 to 9, 11 to 19, 21 to 24); 56 (1 to 9, 11 to 19, 21 to 24); 57 (1 to 7, 9, 11 to 19, 21 to 24)
National Digital Preservation Program, China
1997-2019
Preserved
2025-12-04
Preserved : 4 (1 to 9, 11 to 19, 21 to 24); 5 (1 to 9, 11 to 19, 21 to 24); 35 (1 to 9, 11 to 17); 36 (1 to 9, 11 to 17); 37 (1 to 9, 11 to 19, 21 to 24); 38 (S1, 1 to 9, 11 to 19, 21 to 24); 39 (1 to 9, 11 to 19, 21 to 24); 41 (1 to 9, 11 to 19, 21 to 24); 42 (1 to 9, 11 to 19, 21 to 24); 43 (1 to 9, 11 to 19, 21 to 24); 44 (1 to 9, 11 to 19, 21 to 24); 45 (1 to 9, 11 to 19, 21 to 24); 46 (1 to 9, 11 to 19, 21 to 24); 47 (1 to 9, 11 to 19, 21 to 24); 48 (1 to 9, 11 to 19, 21 to 24); 49 (1 to 9, 11 to 19, 21 to 24); 51 (1 to 9, 11 to 19, 21 to 24); 52 (1 to 9, 11 to 19, 21 to 24); 53 (1 to 9, 11 to 19, 21 to 23); 54 (1 to 9, 11 to 19, 21 to 24); 55 (1 to 9, 11 to 19, 21 to 24); 56 (1 to 9, 11 to 19, 21 to 24); 57 (1 to 7, 9, 11 to 19, 21 to 24)