H.A. Hyde (Hyde, H.A. / H. A. Hyde / Hyde, H. A.)

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  Welsh Ferns, Clubmosses, Quillworts and Horsetails: Clubmosses, Quillworts and Horsetails - A Descriptive Handbook
  by H.A. Hyde, A.E. Wade
  Softcover, National Museum of Wales (Amgueddfa Genedlaethol Cymru), ISBN 0720004357 (0-7200-0435-7)
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  Welsh Timber Trees: Native and Introduced
  by S. G. Harrison, National Museum of Wales, H. A. Hyde
  Hardcover, National Museum of Wales, ISBN 0720002028 (0-7200-0202-8)