Nielsen, H. A <br/><br/>
Methods of natural science 

 - Engelwood Cliffs :  Practice Hall,  1967 
 - xv, 70p.;  22,5 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Métodos<br/>Ciencia
<br/><br/><label>Universal Decimal Class. No.: </label>5.02