00397nam a2200133 a 450000100080000000500110000800800410001910000210006024500820008126000360016330000110019950000290021065300240023910114562008-06-30 1992 bl uuuu m 00u1 u #d1 aSILVA, L. M. da. aA knowledge-based expert system for recommendation of conservation practices. aPurdue: Purdue Universityc1992 a134 p. aDissertacao de mestrado. aConservacao do solo