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Library of Congress
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Preserved
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2025-04-07
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60 (3, 4); 61 (1 to 4); 62 (1 to 4); 63 (1, S1, 2 to 4); 64 (1 to 4); 65 (1 to 4); 66 (1 to 4); 67 (1 to 3)
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National Digital Preservation Program, China
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Preserved
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2025-10-23
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Preserved : 67 (2 to 4)
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National Digital Preservation Program, China
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Preserved
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2025-12-04
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Preserved : 67 (2 to 4)
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National Library of the Netherlands
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Preserved
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2024-12-15
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Preserved : 58 (1-4); 59 (1-4); 60 (2-4); 61 (1-4); 62 (1-3)
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Scholars Portal
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Preserved
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2025-09-02
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Preserved : 58 (1 to 4); 59 (, 1 to 4); 60 (, 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 to 4); 67 (, 1 to 4); 68 (, 1, 2); 2015; 2016; 2017; 2018; 2019; 2020; 2021; 2022; 2023; 2024; 2025
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LOCKSS Archive
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In Progress
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2026-02-09
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58 to 63
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CLOCKSS Archive
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Preserved
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2026-02-09
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58 to 68
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Portico
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Preserved
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2026-02-12
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Preserved : 2015: 58(1-4), 2016: 59(1-4), 2017: 60(1-4), 2018: 61(1-4), 2019: 62(1-4), 2020: 63(1, S 1, 2-4), 2021: 64(1-4), 2022: 65(1-4), 2023: 66(1-4), 2024: 67(1-4), 2025: 68(1-4)
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