https://biblioteca.utla.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=au%3A%22Ernest%2C%20John%20W.Dorr%2C%20Eugene%20L.%20%28consultor%29%22&sort_by=relevance&format=rss 2 0 50 ISBN:9684514549 https://biblioteca.utla.edu.sv/cgi-bin/koha/opac-detail.pl?biblionumber=3127 By Ernest, John W.Dorr, Eugene L. (consultor).
México McGraw-Hill / Interamericana 1988 .
126 p. il.; 27 cm. 9684514549

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]]> https://biblioteca.utla.edu.sv/cgi-bin/koha/opac-detail.pl?biblionumber=3127 ISBN:9684514530 https://biblioteca.utla.edu.sv/cgi-bin/koha/opac-detail.pl?biblionumber=3126 By Ernest, John W.Dorr, Eugene L. (consultor).
México McGraw-Hill / Interamericana 1988 .
123 p. il.; 27 cm. 9684514530

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