na 1969

1969. Guía de enseñanza aritmética en preparatoria. 6pp.

@misc{118263,
  pages      = {6},
  title      = {Guía de enseñanza aritmética en preparatoria},
  year       = {1969},
  country    = {Ecuador [EC]},
  lgcode     = {Spanish [spa]},
  macro_area = {Eurasia},
  sil_id     = {13273},
  src        = {sil16},
  subject    = {Arithmetic [Zarth], Teacher's guides [Ztgd]}
}