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Portico
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Preserved
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2026-05-28
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Preserved : 1956: 1(C), 1957: 2(C), 1959: 3(C), 1961: 4(C), 1964: 5(C), 1965: 6(C), 1966: 7(C), 1971: 8(C, ), 1975: 9(C), 1977: 10(C), 1979: 11(C, Index), 1980: 12(C), 1981: 13(C), 1981: 13-14
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Scholars Portal
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Preserved
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2026-03-19
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Preserved : 1 (Complete); 2; 3; 4; 5; 6; 7; 8; 9; 10; 11; 12; 13-14; 15; 16; 17; 18; 19; 20 (1, 2, 3-4, 5-6); 21 (1-2, 3, 4, 5-6); 22 (Index, 1-2, 3-4, 5, 6, 7-8); 23 (1 to 4, 5-6, 7-8, 9-10)
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Portico
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Preserved
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2026-05-28
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Preserved : 1984: 15(C), 1986: 16(C), 1990: 17(C), 1991/1992: 18(Part 1, Part 2, ), 1992: 19(C), 1995: 20(1-6), 1996: 21(1-6), 1997: 22(1-8), 1998: 23(1-10)
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Internet Archive
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Preserved
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2025-08-08
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1 to 19
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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; 2; 3; 4; 5; 6; 7; 8; 9; 10; 11; 12; 13-14; 15; 16; 17; 18; 19; 20 (1, 2, 3-4, 5-6); 21 (1-2, 3, 4, 5-6); 22 (I1, 1-2, 3-4, 5, 6, 7-8); 23 (1-4, 5-6, 7-8, 9-10); 94 (2)
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