Internet Archive
1960-1979
Preserved
2025-08-08
13 to 32
Scholars Portal
1949-2018
Preserved
2026-03-19
Preserved : 1 (2, 3); 2 (1 to 3); 3 (1 to 3); 4 (2, 3); 5 (1 to 3); 6 (1, 2-3); 7 (1 to 3); 8 (1 to 3); 9 (1 to 3); 10 (1 to 3); 11 (1 to 3); 12 (1, 2); 13 (3); 14 (1 to 3); 15 (1 to 3); 16 (1, 3); 17 (1 to 3); 18 (1 to 4); 19 (1 to 4); 20 (1 to 4); 21 (1 to 4); 22 (1 to 4); 23 (1, 3, 4); 24 (1 to 4); 25 (sup1, 1 to 4); 26 (1 to 3); 27 (1 to 3); 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 (1-2, 3, 4); 38 (1, 2, 3-4); 39 (1, 2, 3-4); 40 (1-2, 3, 4); 41 (1, 2, 3-4); 42 (1, 2, 3-4); 43 (1, 2, 3-4); 44 (1, 2, 3-4); 45 (1, 2, 3-4); 46 (1, 2-3, 4); 47 (1, 2, 3-4); 48 (1, 2, 3-4); 49 (1, 2, 3-4); 50 (1, 2, 3-4); 51 (1, 2, 3-4); 52 (1-2, 3-4); 53 (1, 2, 3-4); 54 (1 to 4); 55 (1 to 4); 56 (1 to 4); 57 (1 to 4); 58 (1 to 4); 59 (1 to 4); 60 (1-2, 3, 4); 61 (1 to 4); 62 (1 to 4); 63 (1 to 4); 64 (1 to 4); 65 (2 to 4); 66 (1 to 4); 67 (1 to 4); 68 (1 to 4); 69 (3, 4); 70 (1 to 4); 71 (1, 3, 4)
CLOCKSS Archive
1949-2018
Preserved
2026-04-13
1 to 65, 67 to 71
LOCKSS Archive
1949-2018
Preserved
2026-04-13
1 to 71
Portico
1949-2018
Preserved
2026-04-23
Preserved : 1949: 1(2-3), 1949/1950: 2(1-3), 1950/1951: 3(1-3), 1952: 4(2-3), 1953: 5(1-3), 1954: 6(1-3), 1955: 7(1-3), 1955/1956: 8(1-3), 1956/1957: 9(1-3), 1957/1958: 10(1-3), 1958/1959: 11(1-3), 1959: 12(1-2), 1960: 13(2-3), 1961: 14(1-3), 1962: 15(1-3), 1963: 16(1, 3), 1964: 17(1-3), 1965: 18(1-4), 1966: 19(1-4), 1967: 20(1-4), 1968: 21(1-4), 1969: 22(1-4), 1970: 23(1, 3-4), 1971: 24(1-4), 1972/1973: 25(1-4), 1973: 26(1-3), 1974: 27(1-3), 1975: 28(1-4), 1976: 29(1-4), 1977: 30(1-4), 1978: 31(1-4), 1979: 32(1-4), 1980: 33(1-4), 1981: 34(1-4), 1982: 35(1-4), 1983: 36(1-4), 1984: 37(1-4), 1985: 38(1-4), 1986: 39(1-4), 1987: 40(1-4), 1988: 41(1-4), 1989: 42(1-4), 1990: 43(1-4), 1991: 44(1-4), 1992: 45(1-4), 1993: 46(1-4), 1994: 47(1-4), 1995: 48(1-4), 1996: 49(1-4), 1997: 50(1-4), 1998: 51(1-4), 1999: 52(1-4), 2000: 53(1-4), 2001: 54(1-4), 2002: 55(1-4), 2003: 56(1-4), 2004: 57(1-4), 2005: 58(1-4), 2006: 59(1-4), 2007: 60(1-4), 2008: 61(1-4), 2009: 62(1-4), 2010: 63(1-4), 2011: 64(1-4), 2012: 65(1-4), 2013: 66(1-4), 2014: 67(1-4), 2015: 68(1-4), 2016: 69(1-4), 2017: 70(1-4), 2018: 71(1-4)
Public Knowledge Project PLN
2019-2025
Preserved
2026-04-24
Preserved : ; 72 (1 to 4); 73 (1 to 3); 74 (1 to 4); 75 (1 to 4); 76 (1 to 4); 77 (2 to 4)
Library of Congress
2010-2018
Preserved
2025-04-07
63 (1 to 4); 64 (1 to 4); 65 (1 to 4); 66 (1 to 4); 67 (1 to 4); 68 (1 to 4); 69 (1 to 4); 70 (1 to 4); 71 (1 to 4)
CLOCKSS Archive
2019-2019
Preserved
2026-04-13
CLOCKSS Archive
2020-2023
Preserved
2026-04-13