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Armas, L.F. de & Maes, J.-M. (1999). Uropygi, un orden de Arachnida (Chelicerata) nuevo para Nicaragua. Revista Nicaraguense de Entomologia 50: 13–15. -- Show included taxa
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Ax, P. (1999). Das System der Metazoa. Ein Lehrbuch der phylogenetischen Systematik. Gustav Fischer Verlag, Stuttgart, Jena, New York II. -- Show included taxa
Barba D., R.A. (1999). Revisión sistemática de las familias Ideoroncidae y Bochicidae (Arachnida, Pseudoscorpiones) en Cuba. Universidad de La Habana. [Trabajo de Diploma] -- Show included taxa
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Bell, J.R., Haughton, A.J. & Boatman, N.D. (1999). Population structure of the pseudoscorpion Chthonius ischnocheles (Hermann, 1804) in field margins and the effects of the herbicide glyphosphate. Newsletter of the British Arachnological Society 86: 6–7. -- Show included taxa
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