https://sibi.upn.mx/cgi-bin/koha/opac-search.pl?q=ccl=Provider%3AECI%2C&sort_by=title_az&format=rss 63 0 50 ISBN:9684180659 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=5208 ]]> By Peterson, Roger Tory.
México : ECI, 1983 .
192 p. : 9684180659

]]> Place hold on Las aves /

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=5208 ISBN:9684180039 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=5943 ]]> By Farb, Peter.
México : ECI, 1987 .
192 p. : 9684180039

]]> Place hold on El bosque /

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=5943 ISBN:9684180640 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=28681 ]]> By Howell, F. Clark.
México : ECI, 1988 .
200 p. : 9684180640

]]> Place hold on El hombre prehistórico /

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=28681 ISBN:9684180233 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=31491 ]]> By Farb, Peter.
México : ECI, 1988 .
191 p. : 9684180233

]]> Place hold on Los insectos /

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=31491 ISBN:9684180527 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=45096 ]]> By Went, Frits W..
México : ECI, 1988 .
194 p. : 9684180527

]]> Place hold on Las plantas /

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=45096 ISBN:9684180241 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=45554 ]]> By Ley, Willy.
México : ECI, 1988 .
192 p. : 9684180241

]]> Place hold on Los polos /

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=45554 ISBN:9684180373 https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=46175 ]]> By Eimerl, Sarel.
México : ECI, 1986 .
199 p. : 9684180373

]]> Place hold on Los primates /

]]> https://sibi.upn.mx/cgi-bin/koha/opac-detail.pl?biblionumber=46175