Catolos, Elvira C. et al <br/><br/>
Plane and spherical trigonometry 
Elvira C. et al. Catolos 
 - Malabon City  Mutya Pub  2013 
 - 240 p.; ill.;  26cm 
<br/><br/><label>ISBN: </label>9789718214725 9789789718214 
<br/><br/><label>Subjects--Topical Terms: </label><br/>1. Trigonometry, Planecal<br/>  2. Trigonometry, Spherical