003860000a2200121000450024500730000065000190007365000160009265000190010865300180012704100130014510000170015877300890017510aEvolution of Hypogean species of Opilionids of North middle American14aEspeleología14aEvolución14aBiogeografía fPhalangodidae0 aInglés1 aClarence, J.1 tProceedings of the Eigth International Congress of Speleology31132h1-2q1-15d1981