1 April 1970 - 8 April 1970

Annual meeting 1970: Beddgelert, Caernarvonshire

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21 July 1964 - 28 July 1964

International Botanical Congress Bryological Excursion 1964: Bangor

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10 September 1949 - 16 September 1949

Annual meeting 1949: Bangor

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29 August 1924 - 5 September 1924

Annual Meeting 1924: Llanberis

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