00302nam a22001337a 450000500170000000800410001701000100005801100100006803500110007810000190008924500090010826000410011750200100015820220329142909.0050119d2004 mx ad r 00110 spa d a89343 a90315 a10087100aEcheverria Lan1 c/por aChapingo, Méx. :bEl autor,c2001. aTesis