https://biblioteca.cun.edu.co/cgi-bin/koha/opac-search.pl?q=ccl=au%3A%22Ruiz%20Silva%2C%20Alexander%2C%22&sort_by=relevance&format=rss 4 0 50 ISBN:9789582009205 https://biblioteca.cun.edu.co/cgi-bin/koha/opac-detail.pl?biblionumber=2248 Bogotá : Cooperativa Editorial Magisterio, 2008 .
285 p. 9789582009205

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]]> https://biblioteca.cun.edu.co/cgi-bin/koha/opac-detail.pl?biblionumber=2248 ISBN:9789582009212 https://biblioteca.cun.edu.co/cgi-bin/koha/opac-detail.pl?biblionumber=4343 By Ruiz Silva, Alexander.
Bogotá : Cooperativa Editorial Magisterio, 2007 .
215 p. 9789582009212

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]]> https://biblioteca.cun.edu.co/cgi-bin/koha/opac-detail.pl?biblionumber=4343 ISBN:9789585138391 | 9789585138384 https://biblioteca.cun.edu.co/cgi-bin/koha/opac-detail.pl?biblionumber=82985 .
1 online resource. 9789585138391 | 9789585138384

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]]> https://biblioteca.cun.edu.co/cgi-bin/koha/opac-detail.pl?biblionumber=82985 ISBN:9789585138308 | 9585138301 | 9789585138315 | 958513831X https://biblioteca.cun.edu.co/cgi-bin/koha/opac-detail.pl?biblionumber=83536 By Ruiz Silva, Alexander,.
.
1 online resource : 9789585138308 | 9585138301 | 9789585138315 | 958513831X

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