- Dyer, L.H., English - Ido dictionary, London: 1924, 392+ pp.
- Dyer, L.H., Ido - English dictionary, London: 1924, 408 pp.
- Dyer, L.H., The problem of an international auxiliary language, and its solution in Ido, London: Sir Isaac Pitman & Sons, Ltd., 1923, 171 pp.
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