Scholars Portal
2006-2025
Preserved
2026-03-19
Preserved : 42 (1 to 6); 43 (1 to 6); 44 (1 to 6); 45 (1 to 6); 46 (1 to 8); 47 (1 to 9); 48 (1 to 9); 49 (1 to 9); 50 (1 to 9); 51 (1 to 9); 52 (1 to 9); 53 (1 to 9); 54 (1 to 11); 55 (1 to 11); 56 (1 to 12); 57 (1 to 12); 58 (Suppl, 1 to 12); 59 (Suppl, 1 to 12); 60 (Suppl, 1 to 12); 61 (Suppl, 1 to 8)
Internet Archive
1965-1990
Preserved
2025-08-08
1 to 25
LOCKSS Archive
2012-2019
In Progress
2026-04-13
48, 55
LOCKSS Archive
2013-2018
Preserved
2026-04-13
49 to 54
CLOCKSS Archive
2006-2025
Preserved
2026-04-13
42 to 61
Portico
2006-2025
Preserved
2026-04-16
Preserved : 2006: 42(1-6), 2007: 43(1-6), 2008: 44(1-6), 2009: 45(1-6), 2010: 46(1-8), 2011: 47(1-9), 2012: 48(1-9), 2013: 49(1-3, 5-9), 2014: 50(1-4), 2015: 51(1-9), 2016: 52(1-9), 2017: 53(1-9), 2018: 54(1-11), 2019/2020: 55(1-11), 2020: 56(1-12), 2021: 57(1-12), 2022: 58(1, S 1, 2-5, 7, 9-12), 2023: 59(1, S 1, 2, S 2, 3, S 3, 4-6, 8-12), 2024: 60(1, S 1, 2-4, 6-8, 11-12), 2025: 61(1, S 1, 2, S 2, 3-10)
National Library of the Netherlands
2006-2019
Preserved
2024-12-15
Preserved : 42 (1-4, 6); 43 (1-3, 5, 6); 44 (1-6); 45 (1-6); 46 (1-8); 47 (1-9); 48 (1-9); 49 (1-9); 50 (1-9); 51 (1-9); 52 (1-9); 53 (1-9); 54 (1-11); 55 (1-5)
Library of Congress
2017-2024
Preserved
2025-04-07
53 (7 to 9); 54 (1 to 11); 55 (1 to 11); 56 (1 to 12); 57 (1 to 12); 58 (1, S1, 2 to 12); 59 (1, S1, S2, 2, 3, S3, 4 to 12); 60 (1, S1, 2 to 4)
National Digital Preservation Program, China
2006-2011
Preserved
2025-10-23
Preserved : 42 (1 to 6); 43 (1 to 6); 44 (1 to 6); 45 (1 to 6); 46 (1 to 8); 47 (1 to 5)
National Digital Preservation Program, China
2006-2011
Preserved
2025-12-04
Preserved : 42 (1 to 6); 43 (1 to 6); 44 (1 to 6); 45 (1 to 6); 46 (1 to 8); 47 (1 to 5)
National Digital Preservation Program, China
2011-2024
Preserved
2025-10-23
Preserved : 5 (1 to 9); 6 (Suppl 1, 1 to 6); 47 (1 to 9); 48 (1 to 9); 49 (1 to 9); 51 (1 to 9); 52 (1 to 9); 53 (1 to 9); 54 (1 to 9, 11); 55 (1 to 9, 11); 56 (1 to 9, 11, 12); 57 (1 to 9, 11, 12); 58 (Suppl 1, 1 to 9, 11, 12); 59 (Suppl 2, 1 to 7)
National Digital Preservation Program, China
2011-2024
Preserved
2025-12-04
Preserved : 5 (1 to 9); 6 (Suppl 1, 1 to 6); 47 (1 to 9); 48 (1 to 9); 49 (1 to 9); 51 (1 to 9); 52 (1 to 9); 53 (1 to 9); 54 (1 to 9, 11); 55 (1 to 9, 11); 56 (1 to 9, 11, 12); 57 (1 to 9, 11, 12); 58 (Suppl 1, 1 to 9, 11, 12); 59 (Suppl 2, 1 to 7)