Internet Archive
1950-2001
Preserved
2025-08-08
1 to 43
Scholars Portal
1950-2021
Preserved
2025-09-02
Preserved : 1 (1 to 4); 2 (, 1 to 3); 3 (, 1, 2); 4 (, 1 to 4); 5 (, 1, 2, 3‐4); 6 (, 1, 2); 7 (, 1, 2); 8 (, 1); 9 (, 1 to 4); 10 (, 1 to 4); 11 (, 1 to 3); 12 (, 1 to 4); 13 (, 1 to 3); 14 (, 1); 15 (, 1 to 3); 16 (, 1 to 4); 17 (, 1 to 4); 18 (, 1 to 4); 19 (, 1 to 4); 20 (, 1 to 4); 21 (, 1, 2, 3‐4); 22 (, 1 to 4); 23 (, 1 to 4); 24 (, 1); 25 (, 1 to 3); 26 (, 1 to 3); 27 (, 1 to 3); 28 (, 1 to 3); 29 (, 1 to 4); 30 (, 1 to 3); 31 (, 1 to 3); 32 (, 1 to 3); 33 (, 1 to 3); 34 (, 1 to 4); 35 (, 1 to 3); 36 (, 1 to 3); 37 (, 1 to 4); 38 (, 1, 2‐3, 4); 42 (, 1 to 4); 43 (, 1, 2); 44 (, 1-2, 3-4); 45 (, 1-4); 46 (, 1 to 4); 47 (, 1 to 4); 48 (, 1 to 4); 49 (, 1 to 4); 50 (, 3, 4); 51 (, 1 to 4); 52 (, 1 to 4); 53 (, 1 to 4); 54 (, 1 to 4); 55 (, 1 to 4); 56 (, 1 to 4); 57 (, 1 to 4); 58 (, 1-2, 3, 4); 59 (, 1-2, 3, 4); 60 (, 1-2, 3, 4); 61 (, 1-2, 3, 4); 62 (, 1 to 4); 63 (, 1 to 4); 1950; 1951; 1952; 1953; 1954; 1955; 1956; 1957; 1958; 1959; 1960; 1963; 1964; 1965; 1966; 1968; 1969; 1971; 1972; 1973; 1974; 1975; 1976; 1977; 1978; 1979; 1980; 1981; 1982; 1984; 1985; 1986; 1987; 1988; 1989; 1990; 1991; 1992; 1993; 1994; 1996; 2000; 2001; 2002; 2003; 2004; 2005; 2006; 2007; 2008; 2009; 2010; 2011; 2012; 2013; 2014; 2015; 2016; 2017; 2018; 2019; 2020; 2021
Portico
2022-2024
Preserved
2026-02-12
Preserved : 2022: 64(1-4), 2023: 65(1-4)
Portico
1950-1966
Preserved
2026-02-12
Preserved : 1950/1951: 1(1-4), 1951/1952/1953: 2(1-3), 1953/1954: 3(1-2), 1955/1956: 4(1-4), 1956/1957/1958: 5(1-4), 1959: 6(1-2), 1960: 7(1-2), 1963: 8(1), 1963/1964: 9(1-4), 1964/1965: 10(1-4), 1966: 11(1-3)
Portico
1968-1969
Preserved
2026-02-12
Preserved : 1968: 12(1-4), 1969: 13(1-3), 1969: 14(1)
Portico
1971-1998
Preserved
2026-02-12
Preserved : 1971: 15(1-3), 1972: 16(1-4), 1973: 17(1-4), 1974: 18(1-4), 1975: 19(1-4), 1976: 20(1-4), 1977: 21(1-4), 1978/1979: 22(1-4), 1979/1980: 23(1-4), 1980: 24(1), 1981: 25(1-3), 1982: 26(1-3), 1984: 27(1-3), 1985: 28(1-3), 1986: 29(1-4), 1987: 30(1-2), 1988: 31(1-3), 1989: 32(1-3), 1990: 33(1-3), 1991: 34(1-4), 1992: 35(1-3), 1993: 36(1-3), 1994: 37(1-4), 1996: 38(1-4), 1997: 39(1-4), 1998: 40(1-2)
CLOCKSS Archive
1972-2021
Preserved
2026-02-09
16, 19, 30, 34 to 63
Portico
1999-2001
Preserved
2026-02-12
Preserved : 1999: 41(3-4), 2000: 42(1-4), 2001: 43(1-2)
Portico
2004-2021
Preserved
2026-02-12
Preserved : 2004: 46(1-4), 2005: 47(1-4), 2006: 48(1-4), 2007: 49(1-4), 2008: 50(1-4), 2009: 51(1-4), 2010: 52(1-4), 2011: 53(1-4), 2012: 54(1-4), 2013: 55(1-4), 2014: 56(1-4), 2015: 57(1-4), 2016: 58(1-4), 2017: 59(1-4), 2018: 60(1-4), 2019: 61(1-4), 2020: 62(1-4), 2021: 63(1-4)
National Library of the Netherlands
2006-2007
Preserved
2024-12-15
Preserved : 48 (1-4); 49 (1-4)
National Digital Preservation Program, China
1997-2021
Preserved
2025-10-23
Preserved : 4 (1, 2, 3?4); 5 (1?2, 3, 4); 6 (1-2, 3, 4); 39 (1 to 4); 41 (1?2, 3, 4); 42 (1 to 4); 43 (1, 2, 3?4); 44 (1?2, 3?4); 45 (1?4); 46 (2 to 4); 47 (1 to 4); 48 (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 4); 56 (1 to 4); 57 (1 to 4); 58 (1-2, 3, 4); 59 (1-2, 3, 4); 61 (1-2, 3, 4); 62 (1 to 4); 63 (1 to 4)
National Digital Preservation Program, China
1997-2021
Preserved
2025-12-04
Preserved : 4 (1, 2, 3?4); 5 (1?2, 3, 4); 6 (1-2, 3, 4); 39 (1 to 4); 41 (1?2, 3, 4); 42 (1 to 4); 43 (1, 2, 3?4); 44 (1?2, 3?4); 45 (1?4); 46 (2 to 4); 47 (1 to 4); 48 (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 4); 56 (1 to 4); 57 (1 to 4); 58 (1-2, 3, 4); 59 (1-2, 3, 4); 61 (1-2, 3, 4); 62 (1 to 4); 63 (1 to 4)