I. C. S. Reference library a series of textbooks prepared for the students of the international correspondence school and containing in permanent form the instruction papers, examination questions, and keys used in their various courses : arithmetic, elementary algebra, mensuration, physics 

 - s.l. : Scranton International Textbook company, s.a. 
 - V, 50, 70, 59, 30, 41, 63, 62, 9, 9, 6, 4, 4, 37, 33, 14, 7, 3, 3, XV p. ; 23 cm.  
<br/><br/> Cada parte de la obra con paginación propias. Encuadernación holandesa 
<br/><br/>Incluye índice de contenido 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Matemáticas