00482nam a22001937a 450000500170000000800410001701000100005801100100006803500110007809000100008910000260009924500090012526000410013450200100017559000370018559000420022290100070026499900170027120220329142909.0050119d2004 mx ad r 00110 spa d a89343 a90315 a100871 aTesis00aEcheverria Lan9350671 c/por aChapingo, Méx. :bEl autor,c2001. aTesis aALEPHb10c20130110lUCH01h1503 aCONVERSIONb10c20130109lUCH01h1349 aBK c89343d89343