http://catalogo.fi.uba.ar/cgi-bin/koha/opac-search.pl?q=ccl=au%3AFleming%2C%20Walter%20and%20su-to%3APROBLEMAS%20and%20au%3AGreen%2C%20Geraldine&format=rss2 6 0 50 ISBN http://catalogo.fi.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=2621 México : Trillas, 1967 . 43 p. : , Tít. orig.: Topics in mathematics for elementary school teachers. Booklet Numbr 3 : numeration systems for the whole numbers 23 cm.

]]> http://catalogo.fi.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=2621 ISBN http://catalogo.fi.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=2623 México : Trillas, 1964 . 45 p. : , Tít. orig.: Topics in mathematics for elementary school teachers. Booklet number 4 : algorithms for operations with whole numbers 23 cm.

]]> http://catalogo.fi.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=2623 ISBN http://catalogo.fi.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=2624 México : Trillas, 1968 . 61 p. ; , Tít. orig.: Topics in mathematics for elementary school teachers 23 cm.

]]> http://catalogo.fi.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=2624 ISBN http://catalogo.fi.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=2626 México : Trillas, 1968 . 59 p. : , Tít. orig.: Topics in mathematics for elementary school teachers 23 cm.

]]> http://catalogo.fi.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=2626 ISBN http://catalogo.fi.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=2627 México : Trillas, 1968 . 58 p. : , Tít. orig.:Topics in mathematics for elementary school teachers 23 cm.

]]> http://catalogo.fi.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=2627