http://catalogo.fi.uba.ar/cgi-bin/koha/opac-search.pl?q=ccl=callnum%3A%22536.7%2C%20E82%22%20and%20su-to%3ACONSERVACION%20DE%20LA%20ENERGIA&format=rss2 2 0 50 ISBN http://catalogo.fi.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=183 By Estrada, Alejandro de. Buenos Aires : Alsina, 1955 . xv, 614 p. : , Indice general de capítulos | Incluye seis tablas en sobre en contratapa 24 cm..

]]> http://catalogo.fi.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=183 ISBN http://catalogo.fi.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=1249 By Estrada, Alejandro de. Buenos Aires : Alsina, 1951 . xi, 614 p. : , Indice de capítulos 23 cm..

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