Lecturas para maestros de noveno grado. 

 - Hato Rey, P.R.  [s.n.]  1957 [i.e. 1956] 
 - viii, 128p.  ill., diagrs., maps. 
 - Its [Publicaciones, Ser. 3-no 103] .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences--Study and teaching [Secondary]