00378cam a2200169 450000500170000024500170001702000150003410000400004904400160008925000090010504100080011430000230012250000050014583000050015026000380015508200150019320260711133907.0 aEcologíab a8484050653 aMartínez Arnaíz, José Ignacio aEl Salvador a5ª  aspa a207 p. il.; 23 cm. a v aSan Salvador bUCA Editoresc1992 a577bM385e