01173naa a2200145 a 450000100080000000500110000800800410001902200140006010000190007424500520009326000090014552007640015470000170091877300920093512816572006-06-09       1949    bl uuuu     u00u1 u    #d  a0365-06261 aPEREIRA, J. A.  aMadeiras brasileiras empregadas para dormentes.  c1949  aThe fact that the Brazilian railway system passes through zones containing the most different geographical formations and dense forest equally of various kinds, forced engineers to utilize for the substructure of the lines a great number of species of wood. Some of these are found almost all over the country, whilstothers are more or less restricted to certain districts. In the beginning it was easy to find durable, decay-resisting species, then plentiful, but later on it became necessary to tolerate some that were less suitable. Examinations of railway-company specifications shower that about one hundred different kinds of wood are accepted for sleepers. As many woods are given different names in different regions, the number of species must be ...1 aMAINIERI, C.  tAnuario Brasileiro de Economia Florestal, Rio de Janeirogv. 2, n. 2, p. 224-250, 1949.