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Internet Archive
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Preserved
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2025-08-08
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18
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CLOCKSS Archive
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Preserved
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2026-05-11
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1 to 20
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Portico
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Preserved
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2026-05-14
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Preserved : 1967: 1(1-2), 1968: 2(1-2), 1969: 3(1-2), 1970: 4(1-2), 1971: 5(1-2), 1972: 6(1-2), 1973: 7(1-2), 1974: 8(1-2), 1975: 9(1), 1976: 10(1-2), 1977: 11(1-2), 1978: 12(1-2), 1979: 13(1-2), 1980: 14(1-2), 1981: 15(1, S 1, 2), 1981/1982: 16(1-2, S 2, S), 1982/1983: 17(1, S 1, 2, S 2), 1984: 18(1-2), 1985: 19(1-2, S 2), 1986: 20(1-2, S)
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Scholars Portal
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Preserved
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2026-03-19
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Preserved : 1 (1, 2); 2 (1, 2); 3 (1, 2); 4 (1, 2); 5 (1, 2); 6 (1, 2); 7 (1, 2); 8 (1, 2); 9 (1); 10 (2); 11 (1, 2); 12 (1, 2); 13 (1, 2); 14 (1, 2); 15 (Supplement, 1, 2); 16 (Supplement, 1, 2); 17 (Supplement, 1, 2); 18 (1, 2); 19 (Supplement, 1, 2); 20 (Supplement, 1, 2)
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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 : 1 (1, 2); 2 (1, 2); 3 (1, 2); 4 (1, 2); 5 (1, 2); 6 (1, 2); 7 (1, 2); 8 (1, 2); 9 (1); 10 (2); 11 (1, 2); 12 (1, 2); 13 (1, 2); 14 (1, 2); 15 (S1, 1, 2); 16 (S2, 1, 2); 17 (S1, 1, 2); 18 (1, 2); 19 (1, 2); 20 (1, 2)
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