00481nam a22001937a 4500 20220329142909.0 050119d2004 mx ad r 00110 spa d 89343 90315 100871 Tesis Echeverria Lan 35067 /por Chapingo, Méx. : El autor, 2001. Tesis ALEPH 10 20130110 UCH01 1503 CONVERSION 10 20130109 UCH01 1349 BK 89343 89343