Scholars Portal
1937-2026
Preserved
2026-03-19
Preserved : 1 (1 to 3); 2 (1, 2, 3-4); 3 (1-2, 3-4); 4 (1-2, 3-4); 5 (1-2, 3-4); 6 (1 to 3); 7 (1 to 3); 8 (1 to 3); 9 (1 to 3); 10 (1 to 3); 11 (1 to 3); 12 (1, 2-3); 13 (1 to 3); 14 (1 to 3); 15 (1 to 3); 16 (1-2, 3); 17 (1 to 3); 18 (1 to 3); 19 (1 to 3); 20 (1 to 3); 21 (1, 2-3); 22 (1 to 3); 23 (1 to 3); 24 (1 to 3); 25 (1 to 3); 26 (1 to 3); 27 (1 to 3); 28 (1 to 3); 29 (1 to 3); 30 (1 to 3); 31 (1 to 3); 32 (1 to 3); 33 (1, 2-3); 34 (1 to 3); 35 (1 to 3); 36 (1 to 3); 37 (1 to 3); 38 (1 to 3); 39 (1 to 3); 40 (1 to 3); 41 (1 to 3); 42 (1 to 3); 43 (1 to 3); 44 (1 to 3); 45 (1 to 3); 46 (1 to 3); 47 (1 to 3); 48 (1 to 3); 49 (1 to 3); 50 (1 to 4); 51 (1 to 3); 52 (1 to 3); 53 (1 to 3); 54 (1 to 3); 55 (1 to 3); 56 (1 to 3); 57 (1 to 3); 58 (1 to 3); 59 (1 to 3); 60 (S1, 1 to 4); 61 (1 to 4); 62 (1 to 4); 63 (1 to 4); 64 (1 to 4); 65 (1 to 4); 66 (1, 2-3, 4); 67 (1 to 4); 68 (1, 2-3, 4); 69 (1 to 4); 70 (sup1, 1 to 4); 71 (1 to 4); 72 (1, 2, 3-4); 73 (1)
Internet Archive
1937-1976
Preserved
2025-08-08
1 to 23
LOCKSS Archive
1961-2012
Preserved
2026-04-13
9, 11, 12, 15, 17, 18, 21, 22, 24, 25, 27, 29, 32, 34 to 36, 39, 41, 43, 45, 49 to 59
CLOCKSS Archive
2010-2015
Preserved
2026-04-13
57 to 62
Portico
1937-2015
Preserved
2026-04-16
Preserved : 1937/1938: 1(1-3), 1938/1946: 2(1-4), 1948/1949: 3(1-4), 1949/1951: 4(1-4), 1953/1956: 5(1-4), 1957/1958: 6(1-3), 1959: 7(1-3), 1960: 8(1-3), 1961: 9(1-3), 1962: 10(1-3), 1963: 11(1-3), 1964: 12(1-3), 1965/1966: 13(1-3), 1967: 14(1-3), 1968: 15(1-3), 1969: 16(1-3), 1970: 17(1-3), 1971: 18(1-3), 1972: 19(1-3), 1973: 20(1-3), 1974: 21(1-3), 1975: 22(1-3), 1976: 23(1-3), 1977: 24(1-3), 1978: 25(1-3), 1979: 26(1-3), 1980: 27(1-3), 1981: 28(1-3), 1982: 29(1-3), 1983: 30(1-3), 1984: 31(1-3), 1985: 32(1-3), 1986: 33(1-3), 1987: 34(1-3), 1988: 35(1-3), 1989: 36(1-3), 1990: 37(1-3), 1991: 38(1-3), 1992: 39(1-3), 1993: 40(1-3), 1994: 41(1-3), 1995: 42(1-3), 1996: 43(1-3), 1997: 44(1-3), 1998: 45(1-3), 1999: 46(1-3), 2000: 47(1-3), 2001: 48(1-3), 2002: 49(1-3), 2003: 50(1-4), 2004: 51(1-3), 2005: 52(1-3), 2006: 53(1-3), 2007: 54(1-3), 2008: 55(1-3), 2009: 56(1-3), 2010: 57(1-3), 2011: 58(1-3), 2012: 59(1-3), 2013: 60(1-4), 2014: 61(1-4), 2015: 62(1-4)
LOCKSS Archive
1937-2024
Preserved
2026-04-13
1 to 71
CLOCKSS Archive
1937-2025
Preserved
2026-04-13
ahead-of-print to 72
LOCKSS Archive
2025-2026
In Progress
2026-04-13
72, 73
Portico
1938-1938
Preserved
2026-04-16
Preserved : 1938: 2(1-2)
Portico
1949-1949
Preserved
2026-04-16
Preserved : 1949: 3(3-4)
Portico
1957-1964
Preserved
2026-04-16
Preserved : 1957/1958: 6(1-3), 1959: 7(1-3), 1960: 8(1-3), 1961: 9(1-3), 1962: 10(1-3), 1963: 11(1-3), 1964: 12(1)
Portico
1965-1968
Preserved
2026-04-16
Preserved : 1965/1966: 13(1-3), 1967: 14(1-3), 1968: 15(1-3)
Portico
1969-2026
Preserved
2026-04-16
Preserved : 1969: 16(3), 1970: 17(1-3), 1971: 18(1-3), 1972: 19(1-3), 1973: 20(1-3), 1974: 21(1-3), 1975: 22(1-3), 1976: 23(1-3), 1977: 24(1-3), 1978: 25(1-3), 1979: 26(1-3), 1980: 27(1-3), 1981: 28(1-3), 1982: 29(1-3), 1983: 30(1-3), 1984: 31(1-3), 1985: 32(1-3), 1986: 33(1), 1987: 34(1-3), 1988: 35(1-3), 1989: 36(1-3), 1990: 37(1-3), 1991: 38(1-3), 1992: 39(1-3), 1993: 40(1-3), 1994: 41(1-3), 1995: 42(1-3), 1996: 43(1-3), 1997: 44(1-3), 1998: 45(1-3), 1999: 46(1-3), 2000: 47(1-3), 2001: 48(1-3), 2002: 49(1-3), 2003: 50(1-4), 2004: 51(1-3), 2005: 52(1-3), 2006: 53(1-3), 2007: 54(1-3), 2008: 55(1-3), 2009: 56(1-3), 2010: 57(1-3), 2011: 58(1-3), 2012: 59(1-3), 2013: 60(1-4), 2014: 61(1-4), 2015: 62(1-4), 2016: 63(1-4), 2017: 64(1-4), 2018: 65(1-4), 2019: 66(1-4), 2020: 67(1-4), 2021: 68(1-4), 2022: 69(1-4), 2023: 70(1-4), 2024: 71(1-4), 2025: 72(1-4), 2026: 73(1)
National Digital Preservation Program, China
1966-2022
Preserved
2025-12-04
Preserved : 6 (1 to 4); 13 (2); 27 (3); 53 (1 to 3); 54 (1 to 3); 55 (1 to 3); 56 (1 to 3); 57 (1 to 3); 58 (1 to 3); 59 (1 to 3); 61 (1 to 4); 62 (1 to 4); 63 (1 to 4); 64 (1 to 4); 65 (1 to 4); 66 (1, 2-3, 4); 67 (1 to 3); 68 (1, 2-3, 4); 69 (1 to 3)
Library of Congress
2013-2024
Preserved
2025-04-07
59 (1); 60 (S1); 63 (2); 64 (1 to 4); 65 (1 to 4); 66 (1, 2-3, 4); 67 (1 to 4); 68 (1, 2-3, 4); 69 (1 to 4); 70 (sup1, 1 to 4); 71 (1 to 3)