000 00567nam a2200157Ia 4500
001 118252
003 BIBL
005 20160527184654.0
008 780406m1970 mx 00010 spa
110 2 _aNational Council of Teachers of Mathematics.
_wcn
_9141253
_2Local
245 1 3 _aEl sistema de los números racionales ; traducción de Federico Velasco Coba.
260 _aMéxico
_bEditorial F. Trillas
_c1970.
300 _av.
_bill.
500 _aTranslation of : Topics in Mathematics for Elementary School Teachers.
650 0 _aArithmetic
_xFoundations.
_954423
_2Local
999 _c98969
_d98969