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LOCKSS Archive
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Preserved
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2026-02-09
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1 to 5
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CLOCKSS Archive
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In Progress
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2026-02-09
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1 to 6
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Portico
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Preserved
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2026-02-12
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Preserved : 2019: 3(3), 2020: 4(1-3, 5-6), 2021: 5(1-4), 2022: 6(1-4), 2023: 7(1-4), 2024: 8(1, 3-4), 2025: 9(1-2)
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Public Knowledge Project PLN
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Preserved
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2026-02-12
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Preserved : 1; 2 (2); 3 (0 to 2)
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