New Twentieth Century Encyclopaedia 1981, Helicon, Oxford

ISBN-13: 9780091439705

7th Revised edition

Hardcover

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The New Twentieth Century Encyclopaedia 1977, Helicon, Oxford

ISBN-13: 9780091200305

6th Revised edition

Hardcover

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New Twentieth Century Encyclopaedia 1972, Hutchinson, London

ISBN-13: 9780091152109

5th Revised edition

Hardcover

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